Black Bullet

is a Japanese manga series written by Shiden Kanzaki and illustrated by Hon Morino. Serialized under the Dengeki Maoh magazine since August 27, 2012, Black Bullet is an ongoing manga series that has its individual volumes published in tankōbon format by ASCII Media Works. The first volume of "Black Bullet" was released in May 27, 2013 with one hundred sixty-four pages in total.

The series follows the downfall of mankind at the hands of viral parasites named Gastrea. Living in despair and horror for ten years, the humans are protected by the organization Civil Security, which specializes in fighting against the Gastrea. Rentaro Satomi, a member of the organization, fights alongside Enju Aihara in the dangerous tasks given to them by the government.

Plot
Rentaro Satomi and Enju Aihara, both forming part of the organization Civil Security, fight together in hopes of returning light to mankind. Enju, commonly referred to as the cursed child due to her connection with the Gastrea; along many other young females, aids Rentaro Satomi in special missions given to them by the government. Kisara Tendo, leader of the Tendo Civil Security Company, guides said characters in their missions against the Gastrea parasites.

Official
Black Bullet Manga (Japanese)

Other Sources
Light Novel