Set in a grim, near-future Tokyo besieged by parasitic creatures called Gastrea, humanity clings to life behind fortified barriers. Rentaro Satomi, a young Civil Officer, teams up with Enju Aihara, a young girl empowered by Gastrea genes, to patrol the streets and hunt the monsters. As they uncover political corruption and mounting threats, this unlikely duo must rely on each other to protect the last bastion of humanity.

Set in a grim, near-future Tokyo besieged by parasitic creatures called Gastrea, humanity clings to life behind fortified barriers. Rentaro Satomi, a young Civil Officer, teams up with Enju Aihara, a young girl empowered by Gastrea genes, to patrol the streets and hunt the monsters. As they uncover political corruption and mounting threats, this unlikely duo must rely on each other to protect the last bastion of humanity.