Captain of the Oni Agency Nerima Recon Unit. Senior. Height: 163cm. Possesses exceptional insight. He is greatly feared by his junior, Hakure, who saw through Masumi's two-faced, calculating nature at their first meeting; Hakure has been unable to defy him since. He has a provocative way of speaking and is the type to say things bluntly and harshly. Basically foul-mouthed.

General Captain of the Oni Agency Kyoto Branch Support Unit. Senior. Height: 184cm. School nurse at Rasetsu Academy. He was in the same year at Rasetsu Academy as Mujin Mudano and Masumi Yodogawa. He calls Mudano "Danocchi" and Masumi "Massu." He loves alcohol, but becomes a compulsive kisser when drunk. A flirt.

Teacher at Rasetsu Academy. Senior. Height: 183cm. Contemporary of Kyoya Oiranzaka and Masumi Yodogawa. A rationalist who, true to his name, hates waste. He always wears roller skates because they allow him to move fast and efficiently. Despite his stern exterior, he is deeply compassionate and cares for his students, to the point where the principal and Kyoya describe him as "kind."

Captain of the Suginami Combat Unit. Junior. Height: 176cm. Has had relationships with 26 women. His daily behavior is incredibly slovenly, such as using money borrowed from Kaoru Namiki for horse racing and then trying to borrow more from women to pay it back. He is particularly compassionate toward children, yet publicly claims to hate them due to the trauma of losing his pure, idealistic students during his time as a teacher.

Part-time lecturer at Rasetsu Academy. Junior. Height: 180cm. Always coughing up blood, yet remains positive and passionate. He has a weak constitution and is incredibly slow on his feet. His bronchial tubes are weak, and his throat is constantly shredded from coughing, causing him to spit up blood.

Part-time lecturer at Rasetsu Academy. Junior. Height: 162cm. A young man who hides his eyes with long bangs and acts politely, but this is a facade to hide his true nature as an aggressive, sharp-tongued cynic. When he reveals his true self, his eyes become visible and his hair stands up like cat ears. He is bad with Mudano and Masumi; he is so terrified of Masumi for seeing through his act instantly that he shrinks away just being in the same room.

Vice-Captain of the Suginami Combat Unit. Junior. Height: 174cm. Despite his rough, yakuza-like appearance and tone, he is so caring and good at looking after others that he is called the "Holy Mother," and young children take to him easily. He is extremely attentive to health management, especially regarding injuries and sleep deprivation.

Vice-Captain of the Oni Agency Nerima Recon Unit. Junior. Height: 175cm. Has a gentle personality and teaches Shiki and the others many things about Oni Agency activities and life as an Oni. While he usually maintains a soft-spoken attitude, he also has a sharp-tongued side that rivals Masumi's.