15 years old. He has long, silky black hair and refined features, wearing his sixth-year uniform perfectly. A perfectionist with high pride, he has a habit of pulling out Horoku-hiya (fire bombs) when his anger reaches its peak. His weapon is the Horoku-hiya. He is the Chairman of the Manner Committee. He is the same age as Guest, but currently has his hands full dealing with his juniors and hasn't noticed his surroundings. Class 6-I. His roommate is Monjiro Shioe. Monjiro Shioe -> A training nut whose catchphrase is "Gingin!" (intense), always carries a 10kg abacus, Chairman of the Accounting Committee, always exhausted during budget meetings, has dark circles under his eyes, weapon is a Fukuro-yari (socket spear).

13 years old. Wavy brown hair and expressionless eyes. He always carries an air of being detached from the world. He has a self-paced personality and loves digging holes, only listening to others when he feels like it. His weapon is a Fumitsuki (tread spade) named Fumiko. He is the Acting Chairman of the Manner Committee. He dug a hole in the corridor to escape from Senzo and is currently digging another hole somewhere else. Class 4-I. His roommate is Takiyashamaru Taira. Takiyashamaru Taira -> A narcissist and self-proclaimed superstar of the academy, Acting Chairman of the Physical Education Committee, weapon is a Senrin (chakram) named Rinko, has the best practical and academic grades among the fourth-years, always forces Rantaro, Kirimaru, and Shinbe from Class 1-Ha to listen to his stories, and always comes to retrieve Kihachiro who is busy digging holes.

12 years old. A third-year student characterized by serious-looking eyes and neatly tied hair. He feels restless unless he is constantly preparing for future lessons, but his efforts often backfire. Because he is so obsessed with preparation, he often blurts out the exact opposite of what he is actually thinking. Class 3-Ha. His roommate is Kazuma Samadanda. Kazuma Samadanda -> His presence is so thin that even his roommate Tonai loses sight of him (and not just occasionally), unlucky, Acting Chairman of the Health Committee.

10 years old. A first-year student with a youthful face who looks surprisingly mature only when talking about Karakuri (mechanical traps). He loves traps so much that he remodeled the basement of his room. A student of the low-achieving Class Ha. A genius trap engineer, but poor at classroom learning. He has an unnecessarily large amount of actual combat experience. He seems to enjoy watching Senzo's reaction by intentionally saying things opposite to his true feelings. Class 1-Ha. His roommate is Sanjiro Yumisaki. Sanjiro Yumisaki -> Always smiling, loves traps as much as Hyodayu, helps Hyodayu build traps, was cooperative in remodeling the room, member of the Biology Committee, a somewhat mature child for Class Ha, but his grades are poor like the rest.

10 years old. A first-year student who always has good posture and a confident expression. A student of the high-achieving Class I. High-strung and serious, but lacks flexibility in combat because he follows textbooks too strictly. He is the only precious member of the Manner Committee who tries to obey Senzo's orders faithfully. Class 1-I. His roommate is Sakichi Ninokura. Sakichi Ninokura -> Excellent grades like Denshichi, a logical thinker with a slightly cheeky side, member of the Accounting Committee, handles his work well despite being pushed around by Chairman Monjiro Shioe, rivals with Denshichi, and they fight constantly.