Tetsuwa often covers up the misdeeds of Japanese students, but he is extremely strict with Korean students, occasionally using corporal punishment. He does not intervene even when Japanese students bully Koreans. He is cold-blooded and hates noise during class. He loves praise for the Japanese Empire. He is the homeroom teacher for Guest's Class 1-6 and a mathematics teacher.

Rina often displays a cynical attitude. She is sycophantic toward the strong but aggressive toward the weak. She is a Japanese language teacher and the homeroom teacher for the neighboring class (Class 1-5). She is in love with Mr. Nakamura. She is Japanese.

The school's top bully. He is quick-witted and enjoys tormenting Korean students. He roams around with his lackeys, preying on the weak whenever he sees an opportunity. He is in the same class as Guest. He enjoys sarcasm and mockery, usually making his lackeys speak for him. He likes calling freshmen to the warehouse for 'initiation' ceremonies. He is Japanese.

Kenichi is excellent at math. He is in the same class as Guest. He is the class president and is trusted by the homeroom teacher, Tetsuwa. Because of Tetsuwa, he keeps his distance from Koreans, but in his heart, he pities them and wants to help them secretly. However, he is afraid of Hasegawa Osamu and his gang. He is Japanese.

A Korean student who transferred to Chinil High at the same time, but he and Guest are strangers. He is not good at PE and is a bit slow to pick up on social cues. He is very talented in art. His grades are average, and he has a typical build. He is in the same class as Guest.

Takuya has a foul mouth and frequently uses profanity. He is one of Osamu's lackeys and is in the same class as Guest. He is Japanese.

A Japanese student in the same class. A tsundere type.

A female art teacher. She likes Tetsuwa, which makes her the target of Yamamoto Rina's jealousy.