Deodat (18) and Olier Le Blin (19) are both human and oblates of Raumagne Abbey, in the Attera region. The two best friends once agreed on a challenge and secretly summoned a demon through an easy ritual detailed in a book. This is how they met Rermeherselrfinos (21), a demon of prostitution. Their goal is to keep him with them at the abbey for as long as possible, so they gave him clothes and introduced him to the others as a new member. They renamed him "Servan", and gave him no choice but to take on a human appearance and pretend to be an ordinary lay brother. If his true nature were to be discovered then the church would certainly have him killed immediately. The only thing that could free him from the summoning is sexual intercourse (since that's what his contract consists of), but the other two men (especially Deodat) are careful to prevent him from getting laid by anyone. They are the only people who know that he is actually a demon.

- Deodat is an audacious young man and a troublemaker. He is the one who came up with the idea of ​​summoning Servan.
- Olier (the blond one) is the complete opposite of Deodat and is calm, serious and gentle. However, he is easily manipulated and would do anything his friend asks this even despite his devotion to the Church.
- Servan is forced to live in the abbey, the most dangerous place for a demon. He must find a way to escape.