Parasyte: Part 1

Kiseijuu is a movie starring Shôta Sometani, Eri Fukatsu, and Ai Hashimoto. The humanity is suffering from murders all over the globe, called "Mincemeat murders". High school student, Izumi Shinichi has a parasite living off him,...
Alien pods come to Earth and, naturally, start taking over Human Hosts. One such pod only manages to take over one human's, Shin Izumi, right arm. Together they grow and co-exist, all the while the other aliens are making meals of other humans; Shin feels he must put a stop to it all, but his alien, Migi, doesn't see why.