Parasyte -the maxim-

Shinichi Izumi is a normal high school boy whose right hand has become infected with an alien parasite that names itself "Migi" ("right"). Migi is the first parasite to develop a symbiotic relationship with its host, as he and Shinichi slowly develop a grudging friendship. Migi isn't the only Parasite on earth, however, and as cases of Parasites killing humans begin to emerge, humans seek to kill off Parasites. Shinichi and Migi find themselves caught in between these two sides of the struggle over planet earth.Parasyte -the maxim- featuring Nobunaga Shimazaki and Aya Hirano has one or more episodes streaming with subscription on Hulu, free on Crunchyroll, available for purchase on iTunes, and 2 others. It's an action & adventure and animation show with 25 episodes over 1 season. Parasyte -the maxim- is no longer running and has no plans to air new episodes or seasons. It has a high IMDb audience rating of 8.4 (19,415 votes).