Midgar, an all-girl academy, would have been famous just for admitting its first and only male student, Yuu Mononobe. But Midgar is notable for much more: it is a school for just a group of girls known as D's. Each of them possesses extraordinarily significant powers in the creation of dark matter and its manipulation into lethal weaponry. The D's did not exist twenty-five years ago, and they only arose when a rash of strange, destructive beasts known as "Dragons" began to spread over the earth. Surprisingly, they vanished almost as quickly as they emerged. In their wake of devastation, certain females began to be born with insignia on their bodies and powers comparable to those held by the Dragons themselves.