Toru

Toru is the protagonist of Succubus Prison: House of the Lewd Demons although he doesn't have a name in his original medium as his name is filled by the player. He was supposed to be the seventh hero as he came from the world of the Myusca, Nemea, Vinum, but he got killed by the first of them as he was just a normal human.

He's the actual responsible for the Time Loop Event, as his regretful spirit couldn't depart and tethered to Luka, becoming responsible for throwing the hero back in the loops.

Before the events
Coaxed by two thugs, Toru reluctantly joined in an assault and robbery of an isolated house populated by three beautiful girls. He manages to get his hands on a mysterious statue, which is revealed to be a toy to turn time within a given period by Vinum. The robbery turns sour when it's revealed that the girls in question are succubi, and his two partners are killed by Nemea and Vinum while Myusca decides that she will eat him later to have him marinate in fear. Toru desperately looks for a way to escape, and, in an attempt to cury favors from Vinum, get a pizza delivery man killed in the process before the whole group somehow gets teleported to the Paradox World for the sake of the Collaboration Scenario. Upon arriving, he gets instantly killed by Myusca.

He's only mentioned during chapter 6 when Kazuya asks where Myusca got her Proof of Collaboration, upon which Vinum and herself reveals that she got it from eating the man, who was incredibly weak. Eventually, the trio ends up on the run from the Second Generation Seraphs/Lilith Sisters and join Luka after being defeated once and for all.

Time Loop Event
Before the Time Loop itself, his body is brought in by Chrome who does autopsies as extras. His soul tethers to Luka, forcing him to re-live the events from 1PM to 5PM (hour upon which his closest interlocutor goes berserk and have his way with him, either killing him or driving him insane). Eventually, thanks to his friend, Luka manages to identify him as the cause of the events an communicates with his spirit. The hero learns that Toru's regret is responsible for the events and the pizza being ordered, and Luka understands that he has to help Toru at the source if he wants to escape his predicament.

With Promestein and Chrome's help, Luka gets sent to Toru's world and meets the man in the flesh, rapidly earning his trust to escape the place and learning of the numerous danger within the house. After making additional preparations, the hero successfully rescues Toru and the pizza man before the latter enters the house. However, as Luka prepares to return to his world, Toru returns in the succubi's house, completely addicted to the pleasure succubi already brought him.

Trivia

 * During the Collaboration Scenario, Vinum said that Myusca drained him as soon as they arrived, while Chrome's autopsy in the Time Loop event mentions he died before the attack on Finoa.
 * He can suffer three type of fates in the original medium: He either gets drained by one of the mansion residents or a succubus he summoned, or, if he can escape without having tasted the devilish pleasures of succubi once, escape to a new life, although it's implied Myusca eventually hunts him down later. Ultimately, if he died repeatedly and become uncaring, he can summon a Pure White Devil that even Vinum fears and gets destroyed on an existential level before the demon he summoned moves on to devour most of the world.