Riko Sakurauchi

A reserved and polite soul, this modest girl prefers quiet indoor activities, serving as a calm contrast to the high-energy Chika and You. Though she possesses a mature demeanor, she prone to panicking and making errors when under intense pressure. Haunted by a past piano performance failure, she initially avoids the school idol spotlight to avoid feeling "special." However, Chika eventually persuades her to join the group, hoping the experience will reignite her passion for music.