Sei No Kakuritsu — Kiseijг»:

The story begins with a silent invasion: small, worm-like aliens fall from the sky with one goal—burrow into a human brain and take over the host. For high schooler Shinichi Izumi, things go differently. A parasite fails to reach his brain and instead matures in his right hand.

This creature, who eventually takes the name (Japanese for "right"), retains its own cold, logical intellect. Unlike other "successful" parasites that view humans as nothing more than a food source, Shinichi and Migi are forced into a bizarre partnership to survive against their own kind. Why It’s a Masterpiece KiseijГ»: Sei no kakuritsu

The Human vs. The Other: Why Kiseijū: Sei no Kakuritsu Still Haunts Us The story begins with a silent invasion: small,