Wakana Sakai, once a student of the music course at her high school, switched to the common course for some reasons. She has been away from music since. Her schoolmate, Konatsu Miyamoto, used to sing with the school’s chorus group, but was kicked out of the group when something happened. So she left the group to found a new chorus group. She asked her good friend, Sawa Okita, a player named Taichi Tanaka of the badminton team, which was on the verge of being disbanded, a returnee called "Wien", and Wakana to join the new chorus group. This animation is a story of high schoolers in their last summer at high school, told against the background of Enoshima, a famous beach area of Fujisawa, and the areas along Enoden, a famous local railroad.