As far as I know, close to the first porn flick to feature actual flesh eating. From Japan, of course.
In the 70's, German fetish series such as Pain, Violence, and Slave Sex covered most of the ground depicted on this video sleeve including the nailing of body parts to tables, extreme piercing, and genital suspension.
These Euro films did not, however, cover initialing the body with knives and needles, and they did not feature a scene in which a piece of the body is removed with a knife and eaten for real.
Truly a film for a narrow, specific market.
Produced by Dragon Image.
I haven't seen the film myself, but verification of its content comes from a totally credible source.