Black Bullet

Black Bullet takes place in 2021, where a parasitic virus called Gastrea infects humans, turning them into monsters. This has driven the remaining human population to live within the Monolith walls, which are constructed from Varanium, the only material effective against Gastrea. To combat the threat, the Tendo Civil Security pairs female Initiators, children with superhuman abilities caused by the virus, with Promoters who assist and protect them. Enju Aihara, an Initiator, and Satomi Rentaro, her Promoter, form one such team, tasked with containing the growing Gastrea threat in Tokyo.