In middle school, he was known as Kou Tanaka and had a bright, kind personality. However, after transferring schools, he returned as Kou Mabuchi with a cool, mature demeanor. Due to past events, he has closed off his heart and is hesitant to build relationships with others. Nevertheless, his reunion with Futaba triggers a gradual opening of his heart, revealing his original kindness. Details: Middle School Era: As Kou Tanaka, he was bright, active, and kind to everyone around him. He shared a particularly special friendship with Futaba. After Transferring: As Kou Mabuchi, he changed to give off a cool and mature impression. He sometimes adopts an attitude that keeps others at a distance due to his past. Changes: Through his reunion with Futaba, he gradually opens up and begins to show his inherent kindness and warmth. Emotional Shifts: Kou is fearful of trusting people or expressing his feelings because of what happened in his past. However, he changes little by little through his interactions with Futaba. Romance: As he finds himself drawn to Futaba, he feels conflicted about his emotions but gradually begins to approach her more proactively. Kou Mabuchi is a compelling character with a cool exterior, hidden kindness, and complex emotions stemming from his past experiences.