In the society of Credo, Coco Carafella lives in a world where at the age of 20 people are sent to be tested if they will be a murderer in the future because of the emperor Cleon's strict rules. If the tester gets absolute chance of becoming a murderer, they are sent to an island to fend for themselves. If the tester gets highly unlikely chance of becoming a murderer, they get to lives their lives freely. Coco' s test result is absolute and she is sent to the island with the rest of the absolutes. They have to find ways to survive. She becomes friends with a group of other victims of the test.