High school student Yuki suffers from a chronic disease and has lost hope for living. One day she has a life-changing encounter with Aki, her destructive classmate with a beautiful singing voice. Together they decide to form a band with Yusuke who secretly has feelings for Yuki.
Haru and Reo perform as musical duo Haru-Reo. With their indie music, they suddenly get popular. Even with their newfound success, they decide to disband the duo. Haru-Reo go on one last tour together. Their roadie Shima goes with the girls on the tour.
In the spring of a new semester, a "ranking" is sent to Class 2-D. It clearly shows the rankings of all the students and the homeroom teacher. The one who ranks 1st is Himeyama Tsubaki, a kind and popular honor student recognized by everyone. But one day, without any warning, she commits suicide. A few days later, everyone in the class receives a suicide note from Himeyama, and from that day on, the class begins to fall apart.
