Shindo Sosou is a self-centered and cold-hearted person who seeks excitement in his boring days.
Hanami Shirokawa is a high school girl with a strong sense of justice who will extend her hand to anyone within her reach within a 3 meter radius.
The day a man and a woman with opposite humanity meet, the end for all humanity begins.
The two are transported to "Hakobune" and are positioned as new humans by the "concierge", and at the same time are told that the current humans will be reset. The curtain begins on a terrifying survival and catastrophe in which people select people.