Subaru Kamishiro

As Kamishiro Koki's cousin, she is a third-year 'all-rounder' who has earned deep trust from both teachers and students through her outstanding academic and extracurricular abilities. Candid by nature and driven by strong initiative, she frequently teases Koki yet harbors a genuine sense of justice and warmly looks after younger peers. Within the story, she serves as a mature, watchful presence who holds a keen interest in romantic affairs, making her an essential supporting force behind the development of the protagonists' relationship.