Parasyte

Parasyte story gets started when a group of worm-like aliens descend to Earth. in order to inade it. These creatures have the ability to invade humans and animals bodies, taking control over their brains and their nervous system. One of these creatures tried to invade a 17 year-old boy called Shinji, but the alien only was able to control Shinji's right hand. The new "guest" learns how to speak Japanese vey quickly by reading Shinji's school books. Shinji calls the alien "Miggy". Through a symbiotic relation developed betwen Shinji and his alien, they learn how to survive and fight against the alien invasion. Parasyte manga series was written and illustrated by Hitoshi Iwaaki. It was published in Kidansha's Afternoon Magazine from 1990 to 1995