In the middle of summer vacation, 40 high school students from class 2 and 4 are summoned to attend school in an emergency, and are forced to participate in a death game by the sudden appearance of the "Management-chan." The time limit is 24 hours. If you don't kill one person every hour, someone will be killed at random. Can the introverted protagonist Junichi survive with his friends? - LINE Manga's popular series is finally available as a comic! !