The friendship between two girls and the romance they chased over a summer.

Two girls, Tatase Riri and Nakada Chisato, got to know each other after a misunderstanding and subsequently became the best of friends. Together with a group of girls in the same university, they began on an adventure of boy-hunting. However, things began to get complicated after Riri confused that she had had a crush on a DJ Hoshino Kei ever since they met during a fireworks party. And this man happened to be Chisato's boyfriend. Chisato decided to give him up, and he began a relationship with Riri. However, Chisato could not forget him but had to keep it to herself for the sake of her friendship with Riri.