Monster Musume TD

Monster Musume TD is a Gacha Game that saw an independent Collaboration with Monster Girl Quest! during February and March 2023.

It includes characters from the original game interacting with the different monsters present on the island, as the protagonists wanted to take a vacation to a different world.

The title of the crossover in MonsterMusumeTD is 'Monster Girl Quest! Trouble x Confusion.'

Act 1
The story begins as Luka, Alice, and Tamamo suddenly arrive at Gespence Island. When Luka questions if they really are in another world, Alice and Tamamo confirm their successful travel thanks to the differences between the animals and plants in the area. Tamamo also comments that there's a bad vibe in the air, making her feel a sticky sensation on her skin. Before Luka can ask her about it, he realizes that the three of them are the only ones around and asks where the others are. Tamamo explains that there was some kind of shock during the process of traveling to another world and that the Otherworldly Transfer Device had malfunctioned. She guesses that the others are probably scattered around the island. Alice then shows Luka a huge banana she found and he is wowed by its sheer size. However, when the "banana" seems to be alive, wriggling and kicking at Alice's hands, Luka scolds the Monster Lord and tells her to put it back where she found it. After a brief argument, Alice reluctantly does so. Tamamo suggests that Luka and Alice explore the island in search of food while she stays to repair the teleportation device. Luka agrees, saying that they could also take the opportunity to look for the others. Alice, meanwhile, is more concerned with finding something to eat.

After saying goodbye to Tamamo, the Hero and Monster Lord begin to explore the nearby forest. Luka feels a sense of wonder from experiencing otherworldly wildlife while Alice is already eating a weird apple-like fruit she found. As Luka repeatedly admonishes Alice for eating suspicious forage, a shadow flies out from the bushes in front of them, Podel, an Orc girl, appears and mistakes Luka for a poacher knight she can rape. However, before she or Luka can do anything, Suzu, a Pegasus girl, appears and commands the orc girl to stop as it's pretty clear that Luka is a hero and not a knight. Luka is surprised and thinks Suzu is a centaur, which the pegasus girl angrily corrects. Podel however doesn't care if Luka is a hero or a knight since they are all the same to her, and comments on how "sweet and juicy" Luka looks. She also says that by the decree of the Goddess Vivi, everyone that comes to this island except Master, the protagonist of this world, must be punished immediately. Suzu says that that's true, but she points out that Luka has a monster companion, suggesting they're also new arrivals to the island and not hostiles. Luka is left speechless and Suzu apologizes for trying to attack him all of the sudden. She begins to explain the poachers' situation as to why they are suspicious and asks why Luka and Alice are here. Alice replies honestly, adding that they mean no harm and are here just as sightseers. Luka is taken aback and asks Alice if she seriously thinks that they will believe such an outlandish story all out of the blue. To his surprise, Podel and Suzu are understanding, since this isn't the first time travelers from other worlds have come to this island. Suzu tries to ask about their circumstances in more detail, but before Luka can answer, Granberia shows up in a deliriously amorous state.

Luka is relieved that she is safe and asks her if she's alright, but Granberia replies that there has been a strange feeling surrounding her for a while. She then begins to talk about the time when Luka defeated her as she gets closer and brushes Luka's cheek with her hand before making sexual advances on him. Luka soon realizes that there's something odd with her behavior but does nothing to stop her. Alice quickly intervenes and calls Luka a pervert, but she then concludes that the weird magical atmosphere of Gespence has driven Granberia insane. Luka tries to reason with Granberia, but she refuses to talk things out and instead says that as a knight she will bring Luka to his knees and dominate his body and soul with her woman's weapon. Luka and Alice have no choice but to fight her off, while Suzu and Podel also join in to help them out.

The battle begins with a Granberia coming onto Luka and three options are displayed (a reference to how Luka can approach his "battles") the options are: fight, surrender, and beg. Alice scolds Luka if he chooses any of the surrender-like options. Granberia snaps back to her senses after getting beaten and apologizes for showing them something unsightly. She respectfully apologizes again to the pegasus girl after calling her a centaur. Asking a bit more about how she's feeling, Suzu and Podel come to the conclusion that Granberia has contracted the "lewd/unsightly syndrome". Alice asks what is that and Suzu explains that it's a disease that only affects monster girls that have a liking for young boys or adults who look like young boys. Granberia asks about how to cure it since she doesn't know how long she could keep her desires under control, to which Suzu suggests searching for Vivi for help. Luka and Alice introduce themselves again and reiterate that they are only searching for their friends. Suzu tells them to not worry about it and that she knows that they are good guys. Granberia apologizes to Suzu and Podel again for causing great trouble and says that by the rules of the knights she will give them anything they want. This immediately gets Podel to hit on the dragonkin. However, Suzu is able to stop her, explaining that Podel is a pervert that is aroused by the word "knight" and warning Granberia to not get too closer to her, Granberia thanks her and Suzu forcefully restrains Podel before dragging her away. Luka comments that there are a lot of strange monsters on this island to which Alice agrees. The group then goes on a search to find Master and Vivi.

Act 2
At the same time this is happening, Master is visiting a cave alongside Goddess Vivi, the guide of this world, Selene, a Copper Dragon girl, and Kuromi, a Succubus. He came here after receiving a report from the latter that they had seen Rin-chan, a Slime girl, as an adult. Selene and Vivi are suspicious of this as they have never seen any adult slimes on Gespence Island. As MC wonders if Rin has evolved somehow, the group suddenly spots the adult slime girl who's revealed to be Erubetie. The latter's accompanied by Lime. The queen slime is surprised to find a human as she initially thought there were only monsters here. Kuromi is excited to have found the "sexy adult Rin" while Selene wonders if there's something wrong with Kuromi's eyes as it's obvious these two aren't Rin. Vivi is quick to recognize and point out that the two slime girls are not from this world. Erubetie introduces herself and briefly explains that she came here for the chance to travel with Luka. When the party wonders who's Luka and asks her what she's talking about, Erubetie angrily demands to know where they hid Luka. Vivi notices that the two slimes have been infected by the lewd syndrome with local monsters, forcing the party to fight them.

The battle starts and Lime asks MC if he would like the ultimate slime experience and the same choices as earlier are presented, choosing anything but fight results in Vivi hitting Master to knock him awake, and MC complains it was Kuromi who chose that option. As they fight, Erubetie manages to come to her senses, but Lime is still trying to molest MC while everybody else is busy trying to deal with the monsters. Lime manages to carry MC off, although she's holding back on doing anything because she feels she's doing something wrong. Lime wonders if she's hungry and she ends up eating some objects lying around, which turn out to be bombs. While MC is worried, she seems to digest them just fine even when the bombs detonate. MC suggests going fishing. He doesn't have any gear with him, so he feels ashamed, offering her the small amount he could catch. Lime is still very happy since it's her favorite food, but she is still hungry and starts eating poisonous mushrooms. She then goes off to find more stuff to eat while MC chases after her out of concern.

A while later, she's thanking him for all the recommendations to which MC replies that he was suggesting she shouldn't eat those things. Lime wants to thank him for everything he did for her and has sex with him, knocking him unconscious. Sometime later, he wakes up in the same cave he found Lime and Erubetie, and Lime apologizes for overdoing it. MC asks where the others are when suddenly Rin appears. She is angry that another slime girl is hanging around MC, and gets especially angry when Lime implies she and MC had fun together. As Erubetie and the rest arrive, Rin begins growing in size, still mad at Lime. Meanwhile, Vivi and Erubetie finally get to discuss the lewd syndrome. Vivi says the four Beast Gods are all off doing their own thing since being unsealed so gathering them for a cure isn't really viable. Instead, she suggests gathering the four knights to create a pseudo-four god-like power to solve the lewd syndrome. As they talk Kuromi is rubbing MC's butt and MC doesn't refuse for some reason. Rin wants to join in and Kuromi says MC's butt is split right down the middle, so no problem. MC pleads with Selene to help him, but she runs off because she doesn't think she'll be able to restrain herself around MC. In the end, the group finally heads off to search for the rest of the four Heavenly Knights.

Act 3
Meanwhile, Luka and his friends, guided by Suzu, are advancing through the forest, fighting and defeating more waves of monsters. As they walk, Luka makes a comment about how the monsters on this island are different from the monsters that he knows. Podel points out that although they normally are a bit rabid there's something off about them. The group talks a bit about the defeated monsters and their reproductive instincts when Alice looks up at the sky and notices a huge and ominous magic circle covering the whole island. It's the Great Barrier of Babylon, a forbidden art from their world that puts humans in a state of continuous arousal. Luka is surprised by this and wonders why the barrier is affecting monsters when it only worked on humans, Alice says that that's true in their world but this world is far different. The group suspects that the barrier has something to do with the strange behavior of the monsters. Alice suspects that the only one capable of using such magic is Alma Elma. The Monster Lord and Granberia wonder if Alma was somehow driven mad by the syndrome despite being a succubus. Then as Luka casually looks around the perimeter, the bushes in front of him shake, and Rami and another Imp girl named Epil, show up. It seems the imp duo had gotten lost in the woods. Noticing Luka, Rami rushes towards him, her bosom bouncing in the air. She immediately embraces the hero and begins teasing him with her breasts, happy at being reunited. Luka quickly picks up on her unusual behavior and correctly concludes that she has the lewd syndrome as well. Epil gets pissed off for being ignored after guiding Rami here, and also because she's jealous of Rami's huge boobs. With no choice, the group prepares to fight the imp duo. If Luka chooses any of the passive options here, he receives death threats from Alice.

After the battle, Luka lands a final blow on Rami to snap her out of her state. The imp recovers and claims not to be infected. She says that she just wants to make Luka feel good using her body. Alice orders Epil to help her tie down Rami while the local imp wonders why she's being ordered around. Alice is a bit upset that instead of relaxing and enjoying their vacations, they are involved in this mess. She says that this is all her fault for putting the trip plan into Tamamo's hands. Luka doesn't understand what Alice's trying to say, to which a blushing Alice answers him to never mind her. Suzu is surprised that their reason for coming to this world was for a simple vacation. Luka then explains to the pegasus girl their story: He briefly recounts how he encountered Alice as a hero before going on an adventure to spread coexistence between humans and monsters, and then how they worked with all the friends they made along the way to face a crisis that threatened their world. Suzu is dumbfounded by how casual Luka's plan for a trip to another world is, but Podel intervenes and tells her to stop worrying so much about everything. The orc girl for her part still wants to have a "spar" with Granberia. Alice starts to ask about the food on the island to which Podel and Suzu list a series of local dishes. This whets Alice's appetite and improves her mood, and when the Monster Lord says that she wants to find and eat all those dishes, Luka duly reminds her that they must find Alma Elma first. Suzu notices how different Alice's personality is when food is involved, to which Granberia agrees. As Granberia speeds up to catch up with Alice and Luka, Suzu thinks of MC who must be somewhere on the island.

Act 4
Back to MC's side, the group continues the search for the rest of the Heavenly Knights. As they headed up the mountain, they noticed the strange seal above the island. MC seems to be out of breath from so much climbing, however, the real cause is the Great Barrier of Babylon making him horny. Rin offers him to suck it out but the protagonist refuses, preferring to be left alone for now. The girls in the group theorize that the protagonist's unusual behavior has to do with the great magical circle in the sky. Vivi asks Erubetie if she knows anything about it, and the queen slime says she doesn't know anything but believes that the Monster Lord must know something about it. Suddenly, they spot a two-tailed silver Kitsune being chased by Teruru, a Cerberus girl acting as an agent of the law. When MC asks Teruru why is she chasing the kitsune, she replies that she's just doing her job as a police officer after the Kitsune stole fried tofu that was meant to be an offering for Master Haru, also known as Faro Luce and one of the Beast Gods. The kitsune defend herself claiming that it was only because she was hungry after she lost track of Luka and Tamamo. MC tries to convince Teruru to let the kitsune go, but the Cerberus girl refuses at first even as she becomes flustered by the protagonist's words. MC lectures the kitsune about eating other people's foods without permission, he then reaches out his hand and tries to comfort the depressed kitsune. However, Vivi warns him that she could be infected. To no one's surprise, it turns out that she is, and starts molesting the protagonist with her tails. Selene tells MC to get back as the group prepares to bring the kitsune back to her senses.

After the silver kitsune is defeated, Lime asks her if she has calmed down. The kitsune quickly recovers her senses and apologizes to MC for attacking him. Erubetie then asks her if she knows where Tamamo is, to which the kitsune replies that she was on her way to find her before she was chased by Teruru. With the kitsune's guidance, the group is about to start searching for Tamamo. However, before doing so, Alma Elma suddenly shows up, apparently attracted by MC's scent. Erubetie quickly demands the succubus queen to tell her where Luka is. The confused succubi reveal that Luka is nearby, and true to her word the hero and his group are shown coming down the road. As they get closer, Vivi comments on how she can sense tremendous power coming off from Alice, deducing that she must be the Monster Lord. Finally, the two groups meet, with Luka and MC staring at each other without saying a word as if there was something connecting them. The silence is then broken when the female members of both groups begin to greet each other. Suzu and Selene discuss their hardships together, with Suzu complaining about how everybody else got to hang out with MC while she had to stop Podel's knight rape urges toward Granberia. Selene defends herself saying she had to deal with everyone trying to get into MC's pants before asking who's Granberia. Erubetie similarly remarks how jealous she is that Granberia and Alice were with Luka all this time. When Granberia dismisses her question and asks if she is feeling well, Erubetie replies that she can handle the syndrome if only because if she were to eat humans again she wouldn't be able to face Luka.

As the monster girls have their reunion, Luka finally decides to break the ice and asks MC if he is the master Suzu and Podel were talking about. MC meekly confirms it and Luka remarks that even though they have never met before, he feels that they are quite similar to which MC agrees while blushing due to being affected by the barrier. Kuromi intervenes and says that it's a fated love to which MC denies having those feelings. Luka notices the issue and says he's unaffected by the barrier due to being a hero, much to MC's relief, who wishes he could be like that. Kuromi still persists that they are in love while Alma Elma comments on MC's pheromones and compares him to Luka. Kuromi then starts listing MC's good qualities like he's pretty cute and sweet. Alma Elma can't take it anymore and it is obvious that she is infected. Vivi diagnoses Alma with the lewd syndrome while saying that Kuromi is just acting like she always does. The succubus queen tempts Kuromi to follow her succubus instincts and let herself go. She then confesses that she was able to take a large amount of energy from the males of the island using the Great Barrier of Babylon, but that it was just the appetizer for her. Alma Elma wants Kuromi's helps to make Luka and the rest captives to their succubus sex games. Kuromi seems like she's going to resist, but ends up wholeheartedly accepting Alma's plan and even calls her sister.

Alma Elma and Kuromi give Luka and MC the classic three options. Giving in to their temptations results in Alice scolding Luka and Vivi threatening MC while saying that breasts are just bags of fat. Luka confronts Alma Elma and proclaims that he will go all out to stop her to which the succubus queen responds in ecstasy, saying that that's the way and that if he doesn't do so he will never make her give in. Meanwhile, MC knows that Kuromi is still sane and tells her to calm down before she makes Selene angry. However, the succubus says that she loves Selene and is convinced that she won't be too rough on her, even as the copper dragon girl immediately disagrees. After defeating the succubus duo the Great Barrier of Babylon is broken. Kuromi is being scolded for attacking Master, while Alma apologizes to Luka and tells him that she has been just too horny ever since she came to the island. Luka is understanding since it's obvious that she is infected with the syndrome. Vivi then begins to explain the story of the strange disease that has plagued the island and its cure before telling that they need the help of the four Heavenly Knights to create a pseudo-four beast god to cure it. Alma Elma does not fully understand everything but she offers her cooperation. With Alma finally in the group, they decide to go back to Tamamo, who is apparently now in the desert on the other side of the mountain. MC sent Teruru to seek Faro Luce's help as the group heads towards where the last Heavenly Knight is.

Act 5
With the guidance of the two-tails kitsune, the group all makes it to their destination. In some ruins in the desert, Tamamo is tutoring Petra, a Gnome girl, who thanks to her affinity with the earth magic is able to learn Breath of the Earth and make her body strong enough that no blade could hope to pierce her. Tamamo explains to Luka that she was working on the teleporter at the beach, but the damage was more serious than she thought so she was forced to wander around the island in search of the necessary materials to repair it. To her surprise, she ended up meeting Petra and her clay dolls. The Gnome Girl offered to help her after the kitsune explained the situation, so thanks to her Tamamo was able to finish the teleporter just as Luka and the others arrived. Luka is surprised that this island even had versions of the four great spirits, and Tamamo explains to him that there are many spirit-based monsters in this world, like salamander girls, undine girls, and sylphs girls. This information makes Luka interested in meeting them. Petra is grateful to Tamamo for teaching her such a technique, proclaiming that now she will able to keep MC safe. The gnome girl then tries to use Breath of the Earth on MC to make him stronger, but only ends up hardening his lower half. As MC tries to cover his boner, Tamamo begins to show signs of being infected, as the presence of males has supposedly allowed the lewd syndrome to kick in leading to her making come-ons toward both men. With no choice, the group once again is forced to fight against Tamamo and Petra.

After the battle Tamamo quickly gives up, making Alice wonders if she was faking the disease. Tamamo suspiciously denies using the disease as an excuse to try to seduce Luka. Either way, Alice let it slide, and Vivi says it's time to send a report to Teruru and call Faro Luce here. As on cue, Faro Luce suddenly warps in, happily greeting everyone. She briefly tries to flirt with Luka, but Alice quickly pulls him away and prepares to fight. However, Vivi quickly tells Faro Luce to stop doing things that lower her status as a Beast God. Faro Luce complains a bit since she was the one called for help in the first place. Anyway, with the four Heavenly Knights finally reunited the ritual starts. Vivi and Faro Luce channel their powers to create a pseudo-Four Beast God. Alice asks if all this magic power is really needed, but Vivi responds that it's a virus you really need to get out by the roots. The knights absorb the power and wipe out the disease from the group, and now everyone can finally return home without causing some kind of repercussions. Without the disease, Tamamo is feeling great, but she then reveals that the cause of the malfunction in the transporter was a leak of magic power during the warp. So now the device is completely out of power and they don't have enough magic to replenish it after the ritual drained their strength. Fortunately, Petra suggests using the magic of the monster girls of the island as an alternative source to power up the device, MC and the local monster girls heartwarmingly agree to do it. Thus Alice and the rest of the monster girls encircle the transporter and began to send each other's magic over it. However, they overdo it and Luka, Alice, the knights, MC, Vivi, Suzu, Rin, and Kuromi end up being transported to another dimension.

Luka and MC are confused about where they are. Vivi quickly informs everyone that they have been transported to a separate space, a space that does not belong to any world, a place between dimensions. On top of that, it seems there will be issues getting anywhere else since the teleporter didn't come with them. Taking advantage of the situation, Kuromi eagerly suggests starting anew and populating this empty world. Alma Elma is very intrigued with the proposal while Erubetie does not mind as long as she can stay with Luka, but both protagonists are clearly not amused by this. Vivi sarcastically interrupts their daydream to inform them that something enormous is approaching the empty space even though they should be the only ones around. Alice too is on edge as she senses that the great alien power getting closer. An unknown being declares that this is a "Class Two Cross-World Contact" and that it must be erased immediately. Luka is momentarily perplexed, but Alice tells him that they must fight or they will be destroyed, Vivi and MC agree and everyone teams up to fight against the foreign enemy.

Upon defeating Adramelech, and before they can celebrate, the space around them starts upheaving itself as if rejecting their presence. Everything suddenly goes black, and after an unknown period of time. MC is awakened by Teruru and other monster girls who weren't caught up in the warp accident. Everyone is on the beach, and it seems they were able to return to the island safely. Alice wonders about that mysterious place and the strange creature that attacked them, as it was something that she has never seen before. Suzu guesses that maybe it was an invader from another world since there are apparently all sorts of worlds out there just like in science fiction. Suzu is called delusional by the other girls again for bringing up her other worlds delusions again. Kuromi starts talking about her own fantasies with MC while Rin talks about her fantasies of slime children with MC. Alice is a bit annoyed by the lack of urgency after their brush with death, but Vivi says that on Gespence one must be flexible with their way of thinking and live faithfully to their own desires. That's the one rule on this island. Alice muses that that's not a bad way of thinking and that she will follow the rules of this world as Vivi says. She decides then to continue their vacations here and plans to return only after having eaten the island's delicacies. Luka tries to calm her down so he could rest and talk with MC but a hungry Alice grabs him and takes him away. Tamamo and Kitsune get to work on repairing the teleporter yet again, and this time she will make sure it does not explode or malfunction. Alma Elma and Kuromi plan to have a study session to improve each other's skills while a worried Suzu follows them to make sure Kuromi doesn't go out of control again, remarking that she and Kuromi are childhood friends. Granberia turns down Alma's offer to accompany them and instead says that she prefers to have a one-on-one duel against Selene while a still insistent Podel follows them to be able to have her "spar" with Granberia, much to the latter annoyance. Rin takes Erubetie and Lime to the lakeside for clean water. MC and Vivi hope that Luka and his friends can enjoy their stay on the island as much as possible. When he decides to plan for the hospitalities, Vivi agrees, saying that they can prepare a grand feast for everybody.

Epilogue
Luka and his friends are enjoying the local hospitality, with Alice, in particular, eating some food made by Miteras, an Echidna girl. Luka tries it as well against the recommendation of MC who tells him it's for Monster Girl, and the hero finds himself forced to wash down the food with juice. Varina, a Bicorn girl, enjoys the sight of Luka gulping a liquid and says that she would enjoy it if it was MC's own juice when Alma Elma asks. Tamamo asks them to cut it out before the genre changes to Yaoi even as Atheel, a Phoenix girl, is more open to the idea.

At the same time, Rami is discussing with Tantaru, an Incubus girl. They compare who's more developed when the latter remarks that she already banged MC's anus. Vivi even jumps in to remark that Narukepafune even used him as an ice dildo once, and the conversation drifts before Rami can expand on Luka's escapades. However, their argument is cut short when Roviris, an Aquatic Dragon girl, displays her annoyance by throwing a barrel of juice at them and Granberia also vocally expresses her distaste. Eventually, Roviris and Granberia decide that the argument can as well get physical. While Luka's surprised by the outburst of aggression, Alice tries to nobly claim that when in Rome, they should do as the locals do, even as Miteras is cleaning the Monster Lord's mouth. As they prepare for a full-on battle, MC notices the numerical disadvantage their opponents have, and Vivi decides that Atheel, Miteras, Roviris, and Varina will join Luka's team to even the numbers.

After the battle, MC is amazed by the fighting strength of their opponent in spite of their disadvantage as they fight for their pride in Luka, even as Tamamo says that she's holding back. Luka finally joins them to answer their support, but neither MC's intellect nor Luka's might is enough to tip the battle. They end up in a friendly draw. Afterward, Alice is admirative of Miteras' motherly skills and wonders how she will fare with her own kids. Miteras says that she will always consider Alice like a daughter, and Tamamo congratulates the Monster Lord before telling her she can also call her mama. An aggravated Alice tells the kitsune to shut up, and Atheel says to Tamamo that they can enjoy having tea together. Meanwhile, Roviris and Granberia develop a sense of comradery and promise to practice together until her departure.

As Vivi wants to make some closing remarks, MC and Luka collapse with nosebleeds while fully erect. A quick investigation reveals that their drinks had been spiked. Amidst the chaos the culprit, Rupupu, an Alp girl, panics as she intended everyone to fall into a sexual frenzy, allowing her to make sweet love with MC's backdoor. She gets found by Vivi who punishes her while the remainder of the monsters wonder what they should do about the protagonists. Afterward, Alice asks Vivi if she's actually controlling Gespace Island. The cat girl answers she's just one of the Beast Gods as well as a mascot. Alice explains that she was getting suspicious after feeling a threatening presence reminding her of Ilias, but Vivi tells her again that she's just a mascot and doesn't understand complicated topics, dodging the question. Alice decides to drop the subject, saying that she'll instead focus on the nice memories she built with everyone.