Hikari is a young schoolgirl who aspires to become a top rhythmic gymnastics champion, following in the footsteps of her idol, Diliana Gueorguiva. Although she faces numerous setbacks during her routines, she perseveres through hard work. With the assistance and encouragement of Takaaki Oiishi, the school's finest male gymnast, she eventually joins the school's rhythmic gymnastics team. Hikari begins to develop romantic feelings for Oiishi, but she is not alone in this regard; Hazuki Shiina, the school's premier gymnast, also harbors feelings for him. A bond of friendship forms between Hikari and Shiina, yet it is accompanied by rivalry, both in their athletic pursuits and in their affection for Oiishi. Additionally, Hikari finds herself conflicted between her feelings for Oiishi and her lingering emotions for Mao Natsukawa, a childhood friend who serves as the lead singer for the band Mr. D. Mao composes the music for her performances and has held feelings for her since their childhood.