Michitaka Sakai, nicknamed "Mittsu," sports short pink hair and a stocky frame, enduring frequent weight-related jabs from peers Kota Mizuhara, Sanae, and Chika Kudo. Though visibly stung by such remarks, he masks his sensitivity with gruff resilience. A former delinquent and Chika’s middle school acquaintance, he joins the koto club alongside Kota and Saneyasu Adachi, where his past clashes with the club’s refined expectations. Tensions flare when Natsu Momoya critiques his musical skills, bluntly proposing simplified sheet music—a slight that wounds Michitaka’s pride. The rift closes only after Momoya’s sincere apology, showcasing Michitaka’s willingness to mend fences. His tastes lean toward hearty, filling meals, though he pointedly avoids cotton candy, and his discomfort with the seiza posture during koto practice sparks half-serious dieting plans. Beneath his tough exterior lies a tender core: he fights tears upon noticing his younger siblings maturing, revealing a quietly protective familial loyalty. While his musical progress remains understated, his grit in facing physical strains and interpersonal friction helps bind the club together. His history as a reformed troublemaker and Chika’s old friend anchors him within the group’s evolving dynamics, where camaraderie and shared resolve gradually outweigh past struggles.