Renzaburou Taki appears to be a regular salaryman, but in reality, he is a member of the Black Guards—a secret organization that maintains the fragile harmony between the human and demon realms. As the time to renew the peace treaty approaches, Taki is tasked with guarding the important human mystic Giuseppe Mayart, with the help of a demon woman named Makie. However, this is easier said than done; while a dangerous faction of demons has turned to terrorism in hopes of destroying the unity between the two realms, Giuseppe wants nothing more than to sneak off and fool around with women.

The World as we know it has been torn apart shattered by a series of natural disasters that have turned civilization into a brutish nightmare of survival and has left whole cities buried beneath the Earth. It's now a lethal and chaotic place, a place where only the strongest and most savage remain alive. The strongest of them all is a giant warrior known as Violence Jack… Violence Jack tries to avert a civil war brewing among the wretched inhabitants of a subterranean metropolis called Evil Town. Based on a character created by manga horror specialist, Go Nagai. (Source: AniDB)

The survivors of Kanto's Hell Earthquake built a new city and christened it "Hope Town". However, this peaceful town becomes a nightmare when it's raided by the motorcycle gang, "Hell's Wind". They abduct the women while the remaining townsfolk are left helpless against them. Meanwhile, a boy, Subaro, meets Jun. Jun's lover was previously murdered, and the duo help one another to fight against Hell's Wind. The battles are getting more and more difficult, but with the appearance of Violence Jack, the citizens seem to gain the upper hand against Hell's Wind. (Source: AniDB)

On the rooftops of Shinjuku, Genichirou Izayoi fought against Levih Rah, a man who sold his soul to obtain demonic powers, and lost. Ten years later, Shinjuku remains a wasteland of demonic energy while the rest of Tokyo remains largely untouched. One day, Genichirou's son, Kyouya, is watching the news when he sees that Japan's beloved prime minister has been attacked by demonic forces. While he lacks confidence in the Nempo powers he inherited from his father, Kyouya is the only one who stands between Levih Rah and the rest of the world. Along with the prime minister's daughter, Sayaka Rama, Kyouya journeys into Shinjuku to see if he can accomplish what his father could not.