Kodomo no Jikan Ni Gakki

Rin, Kuro and Mimi enter fourth grade with new responsibilities waiting in the classroom. When Mimi is about to be pushed into becoming class representative, Rin volunteers instead, surprising their teacher Aoki with her ability to bring the class together.

Sports-day preparations follow, with Rin working enthusiastically while Mimi dreads running. When Rin later falls ill, her friend sees a vulnerability usually hidden by her confidence, bringing their concern for one another into focus.