Koi ni Ochiru

A girl named Sono Chika has never experienced love until she meets a classmate named Kiyohara, leading to gradual changes in her feelings. In another story, Iwamoto Hazumi, who cannot swim, faces mandatory summer swimming lessons. After a failed attempt to enter the pool, she encounters Ooumi Nariyuki-senpai, whose involvement remains uncertain. Lastly, Yoshitomo and Ginko, who have always clashed, must collaborate to organize a joint Christmas Eve event for their respective classes.