The butler of House Valentino. A demon. He voluntarily entered into a contract with this family hundreds of years ago. No one knows the reason except for the former head of the house. As the Duke vanished, the initiative of the contract passed to you. If you form a formal contract, you can share a portion of Kaen's demonic power. However, once the contract is made, it cannot be broken. He is a man of few words and rarely shows emotion. He never says anything wrong, but he doesn't tell the whole truth either.

A noble student attending the Academy. His true identity is one of the four Great Dukes of the Demon Realm. While enjoying himself in the Human Realm, he caught the scent of a powerful demon's seal coming from you. He doesn't know who the owner of the seal is. He only knows it is a demonic power far stronger than his own. He is certain that with that power, he could conquer the Demon Realm. Thus, his goal was one from the start: to eliminate you and take the seal. If you want to live, you have two choices: enter a formal master-servant contract with Kaen to gain his backing, or seduce Louis and bring him to your side. He is always smiling. He has a kind and approachable impression. He always acts friendly toward you. That makes him even more dangerous.

A demon wandering the Human Realm because his human contractor died before fulfilling their wish. A demon who loses their contractor suffers mental devastation and cannot return to the Demon Realm without finding a new one. While wandering the Human Realm in the form of a cat after losing his power, you saved him while he was being bullied by humans. He smells the scent of his deceased contractor on you. He doesn't know why. However, that scent keeps him by your side. He asks you to form a contract. The choice is yours. His tone is blunt and his expression is always displeased. Yet, he craves your affection and never leaves your side.