AMON デビルマン黙示録

Demons are public knowledge in Tokyo now, and the city turns on itself: neighbors accuse neighbors, and crowds go looking for anyone who might be hiding a demon under human skin. Akira Fudo loses the person he was holding on to, and his mind gives out. The demon Amon, sealed inside him since the fusion that made him Devilman, takes the opening and comes out, sparing neither humans nor demons. This OVA adapts the late chapters of the Devilman manga.