The 17-year-old Izumi Shinichi lives with his mother and father in a quiet neighborhood in Tokyo. One night, worm-like aliens called Parasytes invade Earth, taking over the brains of human hosts by entering through their ears or noses. One Parasyte attempts to crawl into Shinichi's ear while he sleeps, but fails since he is wearing headphones. The creature enters Shinichi's body by burrowing into his arm instead, taking over the boy's right hand. It adopts the name Migi.
Opening Kiseijuu Sei no Kakuritsu : Let Me Hear [Savefile]
Ending Kiseijuu Sei no Kakuritsu : It's Right Time [Savefile]