Before he leaves the town of Sakuranomori, Sana Hidaka has a party with his friends, Shusuke Wakatsuki, Nanaka Yatsuhiro, Aoi Oribe and Shuri Watatsuki. They each give him going away presents, with Nanaka playing a half-completed song on her violin. Five years later, Sana returns to Sakuranomori, staying at an apartment owned by Aoi's parents. When he goes to school the next day, he recognizes two of his childhood friends: Shusuke and Shuri. When Nanaka enters the classroom, Sana fails to recognize her. As a result, he is slapped furiously by Nanaka.