Civil Security arc

The Civil Security arc is the first story arc of the Black Bullet series.

Ten years after the Gastrea parasites begin to claw their way onto the top of the food chain, humanity's hope lies at the hands of Civil Security, an organization specialized in fighting Gastrea. Promoter Rentaro Satomi and his Initiator Enju Aihara are tasked by Kisara Tendo to investigate an area in Tokyo said to be breached by a Gastrea.