Utopia was a tower of hope, but it was a tower of despair created by human desires. In Utopia, they were researching the only way to save this world: a vaccine against the monster called Golem. One girl with special antibodies was used as research material. Her name is Mirai, the daughter of Hibiki Mamiya. Hibiki decides to rescue Mirai together with five men who have gathered in Utopia. The men are trying to rescue their loved ones, to save their family and friends, and to steal food and money to survive. Although each of them has their own non-negotiables and some rebellion, they gradually come to resonate with Hibiki's beliefs and decide to fight together..