They start off tiny—like a floating seed, or a virus—and when they come in contact with a human host, they invade and take over.

Once in control, they can hide in plain sight to avoid detection, then contort themselves into terrifying abominations, many times stronger and faster than any human, to hunt their prey.

Only one thing has gone wrong in their stealth invasion. A high school boy named Shinichi managed to arrest his infection with a parasite such that it can only control his right arm. Now the two must depend on each other to survive. But can there be any common ground between predator and prey?