A decade after a virus forces people to live in confinement behind barium walls, two childhood friends with superpowers fight to save the human race.

In the year 2021, a parasitic virus known as "Gastrea" infects humans and turns them into monsters. What is left of mankind now lives within the Monolith walls, walls that are made of Varanium, the only material that can hurt Gastrea. To counter the threat that the Gastrea pose, "Cursed Children"-female children whose bodies contain trace amounts of the virus which grant them superhuman abilities-officially called Initiators by the Tendo Civil Security, are given partners called Promoters, people who work to guide and protect the young Initiators. These teams of two are sent out on missions to fight the monsters created by the Gastrea virus and keep them at bay. Black Bullet revolves around the team of Enju Aihara, an Initiator, and Satomi Rentaro, a Promoter, as they go on missions to fight the growing threat of Gastrea in their hometown of Tokyo.—MAL Rewrite

It's been 10 years since mankind was nearly wiped out by a parasitic virus known as Gastrea. With the survivors of war torn Japan now forced to live within a protective barrier of monoliths, the Gastrea threat is diminished but still present. When a Gastrea does rear its ugly head, it's up to the government employed Civil Security agents to take them down. Enter Promoter Rentaro Satomi and his Initiator, Enju Aihara, as they battle this growing threat that may soon overtake humanity once again.—Sentai Filmworks

In the year 2021, mankind was defeated by Gastrea, a parasitical virus, and is forced to live within a wall made of Varanium Monoliths, a metal that is able to subdue Gastrea. Soon, the "Cursed Children", children born with the Gastrea virus who are able to control it-which gives them superhuman abilities-were discovered. Due to the Gastrea virus' intervention, the Cursed Children could only be female. Civil Securities are formed to specialize in fighting against Gastrea, operating with the pair of an Initiator, who are cursed children, and a Promoter, serving to lead the cursed children.—Crunchyroll

It's the year 2031 and ten years have passed since Rentaro's parents - along with most of mankind - were killed by an alien parasitical virus known as Gastrea. Rentaro, Kisara and Enju have formed the Tendo Civil Security to tirelessly fight against Gastrea.—Apple TV