Sawako Kuronuma begins to socialize with her classmates after a memorable New Year's break and with Valentine's Day around the corner. Despite being attracted to Shouta Kazehaya, a popular student, Sawako hesitates to offer him customary chocolates and decides not to, creating a rift between them due to Kazehaya's own feelings for her. As February ends and April commences, Sawako starts her second year of high school in the same class as her friends Ayane Yano and Chizuru Yoshida, Kazehaya, his friend Ryuu Sanada, and a new student named Kento Miura. When Kento expresses an interest in Sawako, it becomes a test of emotions for her and Kazehaya.