A girl and a bully who targets Shizuka. Despite her cruel personality, her home life is a mess: her father is having an affair and her mother is an alcoholic. She bullies Shizuka because she believes Shizuka's mother is the woman her father is cheating with. She is usually accompanied by four other bullies.

A girl with no friends who is bullied by Marina. Her father left to marry another woman, and her mother doesn't seem to care for her much. Even without friends at school, she feels okay as long as she has Chappy (her dog). The teachers and other students turn a blind eye and refuse to help her.

A boy who has feelings for Shizuka. While he doesn't intend to retaliate against the bullies directly, he tries to help Shizuka in his own way, such as by saying, "Marina... it's time to move to the science lab," to create an opening for her. He has an older brother who always gets 100%. His mother believes Azuma could get 100% if he just tried harder, but since he consistently scores between 89 and 98, she considers him incompetent and has started giving him the "reward" pancakes regardless of his score, as if she's given up on him.