Having narrowly survived death, Kei Nagai and his new ally Kou Nakano scheme vengeance against Satou, a fellow Ajin obsessed with conquering the world. While Satou initiates a series of public executions, humanity scrambles to devise a way to halt the immortal tyrant.
Kei finds unexpected partners among two former foes: senior government official Yuu Tosaki, whose deep study of Ajin provides a strategic edge against Satou, and Tosaki"s Ajin aide Izumi Shimomura. As his coalition gathers more supporters, Kei must act swiftly to stop Satou"s campaign before it destroys the civilization he knows.