Mysterious worm-like aliens fall from the sky. They penetrate through
the ears or nose into human beings and live off their brain while
dominating the body. Now with human appearance, the parasites live among
humans.
Shinichi Izumi is an ordinary high school student. His best friend is Satomi Murano
One day, Shinichi Izumi is attacked by a parasite, but he is able to
fight off the parasite before it takes over his brain. The parasite
though lives within his right hand. Shinichi Izumi and the parasite now
live together. Shinichi believes the parasites are responsible for
countless murders all around the world and he feels responsible, because
he knows the truth.
Meanwhile, Ryoko Tamiya
is a teacher that starts her new post at the same high school where
Shinichi attends. She has been taken over by a parasite and comes to
observe Shinichi.
SOURCE: AsianWiki
