Urotsukidoji: Legend of the Overfiend

The relative coexistence of the human world, demon world and beast world is soon to be disrupted by The Overfiend, an immensely powerful demon who'll be reborn after 3000 years to remake the world to his own liking.
Legend has it that the human race is not the only dominant civilization living on Earth. Two other races exist in this world: the Makai (a demon race) and the Jujinkai (a half-man, half-beast race). Once every 3,000 years, a supreme being known as the "Choujin" (Overfiend) will emerge and bring balance to all three realms on Earth. In present-day Japan, after 300 years of endless searching, a Jujinkai named Amano Jyaku has discovered the presence of the Choujin inside high school slacker Tatsuo Nagumo. But now, Amano, along with his sister Megumi and their sidekick Kuroko must protect Nagumo and his new girlfriend Akemi Ito from the Makai, who believe that Nagumo is not the Choujin, but an evil entity bent on destroying all living beings on Earth. Urotsukidōji: Legend of the Overfiend was originally released as a 3 episode OVA series from January 21, 1987 to April 10, 1989 but was later re-release as a compilation film on March 18, 1989.