BLOOD MUTANT SYSTEM.

The Human Race is faced with a dilemma after an unknown race attacks and abducts humans.

With their intentions unknown, the humans fight dearly for their lives, even though they make little to no progress. While humanity struggles to survive, one particular characters gets chosen to become a walking weapon for the Alien Race, The Granians.

Ace Underwood, who was one of the unlucky thousands that got abducted,wakes up to find himself inside a green tube. With no idea what's going on, he manages to escape only to learn of his new changed form.

[Congratulations: Your DNA is a match with the Blood Mutant Gene.]

[You must consume blood in order to survive.]

Left to roam on the Earth, Ace must now survive from the Granians who wish to use him as biological weapon and learn to cope in a world of humans, and higher, intelligent life forms.