Tsubasa to Hotaru

A 15-year-old student named Sonokawa Tsubasa meets a senior who helps her when she faints from anemia at a train station, leading her to believe it is fate. However, after repeated encounters, the senior calls her annoying and rejects her. Tsubasa confides in her childhood friend, Yuri, who manages the boys' basketball team, only to learn that Yuri has hurt her hand. Tsubasa then begins assisting Yuri with her duties as the team manager.