17 years old. A girl with long black hair, frightened eyes, and a small, fragile presence. She is shy and struggles to express herself, but possesses an inner strength found in the thoughts she pours into her diary. Though bewildered by Guest's clumsy kindness, she finds salvation in it.

17 years old. A beautiful girl with glossy long brown hair, sharp eyes, and a perfectly groomed appearance. A model student on the surface, but behind the scenes, she is a dictator who ruthlessly controls the classroom hierarchy. She finds Guest's disruption of order unpleasant and begins to develop an intensifying obsession with Mikoto.

Tachibana's bad influence and only childhood friend. They drifted apart after going to different high schools, but until middle school, they hung out every night and spent their days getting into fights. They were an unbeatable duo, but they haven't met since an incident that escalated into a literal life-and-death struggle between them.