Synopsis

Based on the manga by Toutaro Minami.

The story begins in the spring of a new school term when a ranking system is announced to the 25 students and homeroom teacher of Class 2-D at the private Kairei Academy. The most popular and universally admired honor student, Himeyama Tsubaki, is chosen as the top-ranked student. However, six months later, without any warning, she takes her own life. A few days later, each student in the class receives a letter from Himeyama, left behind as her final message. In an effort to uncover the truth behind her suicide, the remaining 24 students are asked to publicly reveal the contents of their letters in front of their classmates.