Parasyte 5 - Hitoshi Iwaaki

Kodansha - <p>MONSTERShinichi was just an ordinary high school student, until his body was invaded by a parasite, a horrifying alien being. Now Shinichi is a monster with a human face...and a human conscience. He is unlike anything else in the world-part man, part alien, and caught in a desperate struggle to save his own soul.</p>