Youichi Tanaka

As an English teacher at Futaba's high school, this man shares a surprising secret connection to Kou as his older brother. While he initially caught Futaba's attention due to his resemblance to Kou, he maintains a professional boundary with his student, Shuuko, despite her obvious feelings for him. Though he firmly rejects her romantic advances, he remains a supportive mentor. He also enjoys a lighthearted rivalry with Aya and frequently offers heartfelt guidance to Futaba regarding her relationships.