Kou Mabuchi  

Tanaka, 馬渕 洸

Kou was well-liked in middle school, where he developed a relationship with Futaba that grew stronger over time. However, unexpectedly, he had to move away during the school year due to his parents' divorce. Now, he lives with his father and attends high school under a new last name, which is likely his mother's. Although he initially comes across as distant and uninterested in Futaba, his kinder side gradually emerges as time goes on.