Shizusumi Yagi

As a former classmate of Mafuyu, this talented drummer shares a deep-rooted history with childhood friends Yuki and Hiiragi. Having previously performed alongside them in a band, he maintains strong bonds with his longtime companions. Though he transitioned from age sixteen to seventeen during the series' progression, his musical roots and enduring connections to his old bandmates remain central to his identity and journey throughout the story.