In the future the world will be ravaged by war. World war three had destroyed the world. World war three wasn't just a nuclear war, but a biochemical war. The Johanna Virus has caused everyone in the world to become sterile and the population of humanity is quickly diminishing along with everyones humanity. The world as we know is destroyed, however Jay Kazuki, son of famous scientist Ken Kazuki, is the world's last hope. In the ruins of the old world The UFH arised to be humanity's savior. The UFH decided to split the population of remaining young humans into groups, boys into one group, and girls separate into two. They claim that the creation of the B-Girls was an attempt to battle the Johanna virus and balance the boy-girl ratio. They claimed that their would be a project to save humanity called, operation repopulate. Jay will meet Kin, a B-Girl set to change her fate, and in the midst of it all Jay will learn the truth about his parents and the unfair world they live in. Jay will attempt to save who he can and save the world. In this world, those who cannot fight, are already dead.