The main character, Ao, is a self-centered and cold-hearted person who seeks stimulation in his boring days. Hanami is a high school girl with a strong sense of justice who will extend her hand to anyone within her reach within a radius of 3 meters. The day a man and woman with opposite humanity meet, the end for all humanity begins. The two of them 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.