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Shinichi Izumi was just your average pampered boy with as much attatchment to life as any average high-school second-year, but as he finds out, that life is about to change. Hundreds of serpent like life-forms with the sole intent to eradicate the species of this planet have begun to ravage the world, and with one of them having settled in his right-hand-now-"Migi", Shinichi will need more than the wits he garnered amidst his 17-year old life with his mother tending to him, as he comes across (and is eventually hounded down by) man-eating beasts that have overtaken the lives of the people he holds so dear, a sentient of the species-turned mother, and heck, even those afflicted with the same "condition"!

From Del Rey:
They arrive in silence and darkness. They descend from the skies. They have a hunger for human flesh. They are everywhere. They are parasites, alien creatures who must invade - and take control of - a human host to survive. And once they have infected their victims, they can assume any deadly form they choose: monsters with giant teeth, winged demons, creatures with blades for hands. But most have chosen to conceal their lethal purpose behind ordinary human faces. So no one knows their secret - except an ordinary high school student. Shin is battling for control of his own body against an alien parasite, but can he find a way to warn humanity of the horrors to come?