Some nice and bloody OAV dated 2000 from the horror master himself, Go Nagai.
Japanese Audio only, with added english sub, in x.264 glory.
Not for the Faint of Heart ^_^ ...this time i mean it, you will have nightmares.
Plot Summary: Fear runs rampant throughout Tokyo with the revelation that demons in fact exist amongst us. Paranoia and the darker side of humanity boils onto the streets as people turn on one another, suspecting that anyone could in fact be a demon hiding in human clothing. Amidst the growing tensions, tragedy strikes Akira causing his mind to snap, retreating into his subconscious, allowing his Devilish alter-ego Amon to break free from Akira's cage of flesh and wreak havoc on both human and demons alike.