Former mechanic Mamiya Hibiki goes to a hospital to search for remedy for Kurumi, who disappeared after being infected with the golem virus while carrying his child. Upon arrival, Hibiki realized that the outbreak of the golem virus has already happened in the hospital. During the panic, Ito Aki, a nurse who is pregnant with doctor Igarashi Shuichi's child, was pushed down the stairs by someone, lost her consciousness and later woke up in a room with many golems. To survive in this apocalyptic world for Kurumi, Hibiki cooperates with the survivors in the hospital and decide to a research institute which has the therapeautic drug Hibiki is looking for.