In a bustling modern city inspired by Tokyo, where high school life blends everyday routines with vibrant pop culture, Yumi is a spirited teenager navigating her final year at Sakura High. Orphaned young, she was raised by her music-loving aunt, fostering her deep passion for rhythms and beats. Always seen with her headphones on, Yumi escapes into her playlists while dreaming of starting a band. Her petite frame and accessorized school uniform hide a bold spirit ready for adventures with friends.