On her first day of high school, after tripping into the breasts of a new classmate, Hinami Ayukawa falls in love. The victim of Hinami's blunder, Shiki Hiiragi, invites her to join the basketball team—an exciting proposal to accept, despite Hinami's poor sports skills. In addition, Shiki's awe-inspiring playstyle only leaves Hinami in greater infatuation.

Although intimidated by an upperclassman from the team, Hinami barely stops herself from confessing her love to Shiki. However, this causes a misunderstanding that leads Shiki to believe that Hinami actually loves basketball, and she offers her the team manager position instead. Now, although lacking experience, Hinami must juggle the responsibilities of managing the girls' basketball team and avoiding the judgmental upperclassman, all while trying to grow closer to the one who stole her heart.