Vinum

Vinum is a succubus fought in the collab The Night Country and the Heroes of the Seven Worlds. She comes from Succubus Prison: House of Lewd Demons with Nemea and Myusca. She's a cruel succubus that enjoys corrupting heroes.

Biography
She is first briefly seen at the end of chapter 2 when Kazuya runs into her and Nemea. She's intrigued by the fact that they managed to escape Myusca.

When Kazuya understands that Vinum is a succubus on a league of her own, she enjoys the perspective of tormenting him before she disappears to suck dry more villagers.

The party encounters Vinum again in a library. Luckily, she is too busy reading and doesn't want to be disturbed. The party is once again forced to sneak through a mess to not catch the attention of the succubus. However, when they meet her again after she feasted, she decides to start chasing them. She catches them back just as they're fighting Nemea, and Myusca soon join them again. Fortunately, the party is saved by the intervention of Magatsu, Lauratt and Rigeo as Vinum notices that they would take a risk fighting them.

When Myusca tells Kazuya that she got the Proof of Collaboration when she arrived, Vinum reminds her that she got it from her first victim who was supposed to be the hero of their world, which surprise the succubi as he was incredibly weak. The succubi taunt the heroes as they're now down to six, but Kazuya tells them that he's determined to find a solution.