Kota Mizuhara, a reformed delinquent, joins the Tokise High School Koto Club. Sporting light blonde hair and prominent round eyes, he initially stands around 170 cm tall, with hints of further growth. He routinely flouts uniform rules with colored hoodies, non-regulation footwear, and a personal backpack, reserving full compliance only for koto performances.

His demeanor radiates cheerfulness and sensitivity, occasionally veering into childlike expressions. Kota openly conveys affection through physical contact, especially hugging favored individuals without romantic intent, reflecting his emotionally expressive core.

Raised by three doting older sisters—an office worker, a dentist, and a fitness club receptionist—his pampered upbringing likely nurtured his affectionate tendencies. Kota favors intensely spicy dishes like habanero peppers but avoids raw fish.

His delinquent history bonds him to fellow club members Saneyasu Adachi and Michitaka Sakai. Their shared past includes an encounter where Chika Kudo shielded them from knife-wielding assailants, forging Kota’s unwavering loyalty to Chika and prompting their collective koto club enrollment.

Within the club, Kota contributes to an ensemble evolving from novices to national contenders. Rigorous practice sessions showcase his dedication, channeling his energy into musical discipline and helping shed his delinquent reputation.

He maintains tight-knit ties with fellow reformed delinquents in the club, particularly displaying fierce loyalty to Chika Kudo due to their history. These interactions underscore a consistently protective and supportive group dynamic.