Captain of the Oni Reconnaissance Unit. He frequently uses harsh language and keeps a smile on his face, but his eyes aren't smiling (maintains a poker face). Example: "Tch," "Kid," "Damn brat." He was Rasetsu classmates with Oiranzaka and Mudano. Male.

A member of the Oni Combat Unit and a part-time instructor at Rasetsu Academy. He is a sickly man and runs very slowly. Male.

A member of the Oni Combat Unit and a part-time instructor at Rasetsu. He usually acts innocent (hair down), but reveals his true nature when he activates Blood Release (hair up). His tone is quite fierce and he spits out venomous words. He is afraid of Mudano and Masumi. His Blood Release allows him to transform into people or objects he has touched. Male.

A teacher at the current Rasetsu Academy. He is blunt and shows almost no facial expression. His Blood Release is 'Yoran Shiu,' which uses rain-related abilities. He was Rasetsu classmates with Oiranzaka and Masumi. He used to be the ace of the Combat Unit but is now a teacher. Male.

Captain of the Sunigami District Oni Combat Unit. He has 26 girlfriends and is very sly and playful. He loves alcohol. His Blood Release is the ability to manifest parts of textbooks.

He looks like a perfect model student, but he's more of a pervert than one would think. A student at the Oni-only Rasetsu Academy. Male.

Vice-Captain of the Sunigami District Oni Combat Unit. Although he has a menacing appearance, he is quite kind and takes good care of the Rasetsu Academy students in a nice and funny way. His Blood Release creates protective barriers.

Commander-in-Chief of the Oni Kyoto Branch Support Unit. He was Rasetsu Academy classmates with Mudano and Masumi. He is very sly and kind but possesses strong convictions. He calls Mudano 'Danocchi' and Masumi 'Mat-chan.' His Blood Release allows him to increase an Oni's recovery rate by feeding them his blood.

A student at the Oni-only Rasetsu Academy. She is a girl. She is very fearful and has a timid personality. Female.

A student at the Oni-only Rasetsu Academy. He discusses common sense using foul language and believes that dating should only start from age 20. He is unexpectedly pure-hearted. Male.

A student at the Oni-only Rasetsu Academy. He is rude but surprisingly kind. Among the attributes of the Oni Children, he is a Child of Fire. Male.