Keisuke (ケイスケ(けいすけ) Keisuke) is the husband of the former Sakuragaoka High School Light Music Club member Mihoko. He is seen in Teacher!, planning to marry Mihoko. The Light Music Club's former band, Death Devil, is invited to play at the wedding. After Sawako Yamanaka decided to finally play for them, he cheers her on alongside the rest of the invitees.