Parasyte Vol 1 Lootcrate Exclusive

Parasyte Vol 1 Lootcrate Exclusive by Hitoshi Iwaaki. A Horror manga rated Older Teen, published in English by Kodansha in 2007.

Alien parasites have arrived on Earth, burrowing into human hosts and taking over their brains. One of them fails to reach Shinichi Izumi's head and takes over his right hand instead, and the two are forced into an uneasy partnership as the parasites begin to feed.