Code: Seed Seihi no Uta

On a failed trip to the moon in 2080, humans have discovered moonstones emitting strange radiation. Over the next few years, some quantities of moonstones were secretly released around the world that cause many humans mutated into zombies by its radiation. Controllers of the affected areas tried to cover it up through violent repression. But soon the terrible news comes through, panic rose up, waves swept the world, and order broke down. In the chaos, the source of the zombies start to became out of control and spreads around the world. To fight with these chaos, Apocalypse was build and their researchers try use zombie's mutant cells to transform the human body to gain extraordinary fighting power and immunity against infection. These transformed subject person are known as 'Seed Fire'. These 'Seed Fire' fighters were sent to various places and succeeded in helping people establish several safe areas. And now, new wave are coming...