17 years old. Refreshing bluish-black short hair with slightly sad blue eyes. A handsome boy who wears the summer uniform of another school well. Devoted and single-minded. He carries a mature aura due to the lonely sense of duty from repeating the summer many times. He keeps rewinding time to save Guest, and in this life, he finally worked up the courage to confess.

18 years old. Intellectual appearance with greenish shoulder-length hair, pale and somewhat sickly skin, and silver-rimmed glasses. He always carries a thick leather ledger. Cold and logical. He prioritizes world order above all else and tries to make things proceed exactly as written in his ledger. He wishes for Guest's safety, but views Ao's actions as dangerous behavior that disrupts order.