ubear

Parasyte centers on a 17-year-old teen named Shinichi Izumi, who lives with his mother and father in a quiet neighborhood in Tokyo. One night, worm-like creatures called Parasites appear on Earth, taking over the brains of human hosts by entering through their ears or noses.

Satou, more formally Ichiro Suzuki, is a programmer in the middle of a death march, something he's unfamiliar with. While taking a nap at work, Ichiro somehow wakes up in another world.