Anime adaptation of the legendary manga Hitoshi Iwaki "Parasite". Once in the summer, in one of Japan's towns, strange snow began to flow. It seemed as if these small, fluffy balls fell to the ground. They fell out in one night, leaving no trace behind. And no one, and never would have known about this strange phenomenon, if on this oddity ended. The consequences of these precipitations further influenced the fate of an ordinary Japanese teenager, Shinichi Izumi ... and the fate of all mankind.