Ryunosuke Katagiri

Ryunosuke Katagiri (片桐 龍之介), or more often known by his nickname Oryo (おりょう), is a kindhearted and timid devil who was framed for the murder of his coworker, Minami, while he was working at Bar CALM.

He's careful about controlling his bloodlust and will leave the area as soon as he feels the urge to drink blood. This behavior is linked to an event that happened in his adolescence when he punched someone in a fight and caused him to bleed. He almost killed the boy by drinking his blood.