Mio Tokinoya

Shun Tokinoya's younger sister became unable to walk due to an accident three years ago. While Shun was busy with his part-time job and not home, she felt lonely and objected to the idea of being hospitalized for rehabilitation at a distant hospital, believing it would widen the distance between her and her brother. It is later revealed that her intense brother complex and walking disability are actually psychological in origin, stemming from loneliness and a desire for Shun’s attention. Eventually, the siblings argued over whether she should be hospitalized, leading to a bet: "If you win the tournament, I'll go to the hospital; if you lose, I'll never see you again." During the tournament, she found herself at a disadvantage but, driven by the fear of never seeing her brother again, mustered all her strength and managed to stand up with support. She even delivered a passionate message to Shun through a video call. As a result of Shun's victory in the tournament, his sister kept her promise, was admitted to the hospital, and dedicated herself to rehabilitation.