Mukuchi na Omoi wa Koi to Naru

Yuki, a socially anxious middle school student, faced his first loss in a running competition. Upon entering high school, he encounters his rival once more, who encourages him to join the running club. Kawai, the rival, has a cheerful demeanor that gradually influences Yuki. As Yuki begins to change, he becomes uncertain and attempts to distance himself from Kawai. However, Kawai refuses to accept this separation.