Kiseijuu: Sei no Kakuritsu

In a sudden and silent invasion, alien parasites descend upon Earth, taking over human bodies to survive. These insidious creatures can transform into monstrous forms but often hide behind normal human appearances, making them nearly impossible to detect. High school student Shinichi Izumi becomes a victim when a parasite fails to reach his brain, embedding itself in his right hand instead. This unique situation forces Shinichi and the parasite, named Migi, to coexist uneasily.

Shinichi and Migi must defend themselves from other hostile parasites that view their symbiotic relationship as a threat. As Shinichi struggles to come to terms with his new reality, he must also find a way to protect those around him and warn humanity of the alien threat. Their journey is one of survival and courage, as they fight to maintain control and uncover the true extent of the parasitic invasion.