A manga serialized from 1973 to 1990 by Go Nagai, creator of Mazinger Z.
Due to the level of cruelty (decapitation of children, dismemberment of limbs, exposure of internal organs) and pornographic level depictions, it was not officially released in the West.
Animated in 1986, 1988, and 1990
https://www.youtube.com/embed/nH9IaZVuB1U
(level edit)