Tsukasa Mukai

A gentle and soft-spoken classmate of Mitsumi, this young man shares a long-standing bond with Sousuke that dates all the way back to their middle school years. Known for his quiet demeanor and deeply kindhearted nature, he serves as a steady, supportive presence within the group. His enduring friendship with Sousuke highlights his loyal personality and provides a heartwarming connection to the characters' shared history.