Devilman

In Go Nagai's groundbreaking 1972 manga Devilman, timid teenager Akira Fudo's life is forever altered when his best friend Ryo Asuka reveals that an ancient, bloodthirsty race of demons has awakened to reclaim Earth. Realizing that humanity is powerless against this apocalyptic threat, Ryo orchestrates a terrifying ritual that allows Akira to merge with the fearsome demon champion Amon, transforming him into "Devilman"—a creature possessing the horrific power of a demon but the pure soul of a human. As the demonic invasion escalates and plunges the world into violent paranoia, Akira fights desperately to protect his loved ones, only to discover that the darkness within the human heart may be just as monstrous as the demons he is slaughtering in this tragic, hyper-violent tale of survival and despair.