Shinichi starts as an ordinary kid with a parasite in his hand instead of his head, and the show spends 24 episodes asking whether that accident made him less human or finally showed him what human actually means. The body horror is real, the action is violent, but what destroys you is watching him choose connection over survival, over and over, while everything around him proves connection gets you killed. By the end you realize the show was never about monsters wearing human faces, it was about a human learning to wear his own.
Alien parasites land on Earth with a singular objective: infiltrate human bodies and consume flesh from within. Most succeed in their invasion, replacing their hosts completely while wearing stolen human faces. Shinichi Izumi, a typical high school student, becomes ground zero for something different. When a parasite attempts to burrow into his brain, it instead lodges in his right hand, trapping both creature and boy in an unwilling cohabitation. Unable to kill each other and forced to share one body, Shinichi and his parasite, Migi, form an uneasy alliance. As the teenager discovers the true scope of the invasion, he faces an impossible choice: maintain his humanity while harboring an alien predator, or accept that survival might require becoming something other than human. The line between self-preservation and monstrosity blurs as Shinichi grapples with the question of what he's willing to sacrifice to protect those around him. A horror story about adaptation, loss of innocence, and what it means to remain yourself when compromise becomes necessary.