Satoshi Tainaka

As Ritsu Tainaka’s younger brother, this observant boy often finds himself managing his sister's chaotic mishaps with a maturity that exceeds her own. While he respects Ritsu and maintains a polite bond with her friend Mio, he becomes noticeably shy when the rest of the Light Music Club unexpectedly visits. Driven by curiosity, he occasionally eavesdrops on her rehearsals, yet he remains a devoted sibling who always seeks her permission before heading out with friends.