Ohigashi Ritsuki

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.

Three years ago, in order to save his childhood friend and unrequited love, Yoshino Yuki, a high school student named Mitsuishi Reiya became a nocturnal being who attacks people and slurps their blood. , he meets boys who live in the darkness of the night, hiding the fact that they are nocturnal. In order to escape the violence of night hunting, hide from the public eye, and fight back against their bloodlust without attacking others, they gather at a live house, form a band called 404 not found, and become passionate about music. Each of the members has a history of traveling at night under harsh conditions, and the members sing with a sense of force, expressing their feelings of having nowhere to go in their music. Reiya, who has become a member of such a band, is relentlessly targeted by Kurose Takumi, the leader of the night hunters who hate night hunting.