"You all should disappear!" The Three Cs, social distancing, masked police, and the management crisis at my father's company... Makoto Hamada, a high school student, is fed up with the world where infectious diseases are rampant. One day, Hamada is instructed by his homeroom teacher to remain in the classroom with three of his classmates. Teruo Yasui, Yasushi Tabata, and Ayaka Matsuoka. What happened after school, when I was spending time with classmates I wasn't particularly close with...!? The suspense of human disappearance begins!!