Haruki Mishima and Towa Honda are new students at Aokisora High School and best friends; at a convenience store near their high school, Haruki runs into his classmate Miharu Mashiki, a girl he's recognized since he was little.

Disgusted by the irresponsible and talkative Towa, serious class representative Mami has been avoiding him; even when Mami begins avoiding him even more after a certain incident at the convenience store, Towa is undeterred.

When Towa spots Miharu having a friendly conversation with their classmate Nasa Sanagi in the waiting room of a hospital, he decides to investigate Nasa's identity and his relationship with Miharu for the sake of his best friend Haruki.

After participating in the three-legged race with Mami, Towa believes they've grown closer; things don't go well when he asks her out on a date.

Haruki worries about Miharu's absence from the cultural festival; Haruki's class encourages Mikado's childhood friend Waka Kisaki to run in the student council elections.

Towa and Mami seem to return each others feelings, but their concerns push them apart; worried about the couple, Mishima and Miharu put aside their own relationship to discuss if there's anything that can be done for them.