Since beginning 9th grade, Hiyori had been nursing a crush on Mizuno, a classmate in the adjacent classroom. Unexpectedly, fate intervened when she found herself seated next to Sasamoto, Mizuno's childhood friend. Upon discovering their association, Hiyori appealed to Sasamoto for help. However, she was unaware that Sasamoto, who was only supposed to be a friend, would fall in love with her.