Unbeknownst to humans, demons from an overlapping dimension walk amongst them in the streets of Tokyo. The balance between the worlds is kept by the crow guardian Karas and Yurine, its master and voice of the living city. However, the time of harmony nears the end as the once-Karas Lord Eko returns. Seeking to purge humanity for its evils, he terrorizes the city with his minions that feast on human blood. The ultimate battle between good and evil awaits; can Yurine and her newly initiated Karas prevail against Lord Eko and protect their city against his monstrous horde?
In a world of science, sorcery is rediscovered and rapidly adopted in all areas of industry – but at a high price: an invisible pollution is spreading out across the world. Those who do not take proper precautions become infected, lose their sanity, and become demons. The Sorcery Administration Bureau, along with their Tactical Sorcerers, monitor magic uses and respond to any demonic outbreaks that occur. In this world, Ray Otto is a rogue tactical sorcerer who hunts down demons with reckless abandon. Given that he always gets the job done, the administration generally lets his activities slide. Together with the mysterious girl Kapel Theta, Ray risks his life and humanity to destroy demonkind... when the price is right.
Both of these anime have people wearing powered exoskeletons and fighting demons. There is a lot of gory dismemberment and a mystical theme combined with an apocalyptic future. Strait Jacket is a bit more slow but I think you would enjoy both.
Disturbed by Japan’s emergence as the de facto world leader in robotics, the United Nations instituted an international treaty requiring stringent regulations. When vocal objections failed to overturn the decision, Japan chose to withdraw from the UN and vanished from world view in a self-imposed isolation made possible by an impenetrable electromagnetic barrier. Now, ten years later in 2067, the only means of contact between Japan and the world belongs to Daiwa Heavy Industries, a powerful corporation monopolizing the world’s robotics market. The uneasy truce comes under question when SWORD, a U.S. special forces unit, finds disturbing evidence that Japan may have sinister designs for the rest of the world. SWORD must now infiltrate Japan to separate fact from fiction, but is anyone prepared for the truth?
Kamui has returned to Tokyo with a traumatizing past, but he is not the only one. Many people are returning to Tokyo for the same reason: they play a part in the End of the World. The Dragons of Earth and the Dragons of Heaven now must fight for the destruction or safety of the world. But is this troubled Kamui really the key to saving the world?
X and Karas provide a distinct, fantastic face to the Tokyo underworld. Both explore a city that conceals its ancient traditions with ultra-modern exteriors, a city only those in the know truly understand.
CLAMP's TV series chronicles a young man's involvement in a secret war for the future of the world. Kamui's journey takes him to a Tokyo with its own mores and ideals, an overlapping plane of esotericism and mysticism. Karas suggests another reality, a world of demons, coexists with Japan's megalopolis. Otoha, the guardian crow, straddles these two worlds.
X and Karas are prime examples of urban fantasy, so fans of the genre will be hard-pressed to find anything better.
In the distant future, Earth is being invaded by a mysterious alien race known as the JAM. Though suffering heavy casualties, mankind unites and repels their advance, pushing them back to their homeworld of Fairy. As to not take any chances of another attack, an expeditionary force is formed to pursue and eradicate any who managed to flee. The campaign is successful, with all but a few small pockets of JAM completely destroyed, and preparations are made for the fleet to return to home. Enter Leiutenant Rei Fukai, the pilot of a reconnaissance fighter jet known as the Yukikaze. With victory close at hand, he is assigned to do one final sweep of Fairy to put an end of the threat for good. However, during the flight, he is attacked by an unknown jet that appears to one of mankind's own, and barely manages to escape. Though the JAM are all but gone, it seems a new, more deadly threat has emerged, fiercely determined to stop the fleet from returning home alive...
Jin is an energetic young boy living in a shanty town and making ends meet by performing good deeds for money. However, when his mentor dies during a fight with a strange monster he finally learns the meaning of death. Having been taken in by a stripper named Akemi whom he once saved, Jin begins to live a quiet and normal life - though in reality he is anything but ordinary. With superhuman abilities and a group of mysterious men searching for him under the name of Zet, over the years Jin finds himself drawn into a world of creatures with dangerous powers called "Players". But what is Jin really, and with his vicious methods of defeating these threats, is he really a hero for justice or simply another dangerous monster?
If you enjoyed the action of a super-powered hero with a dark past fighting monsters in Zetman, then look no further than Karas. Karas also has a hero who kicks butt - in spectacular fashion. Overall, it is arguably an all round better series with a more coherent story, but really the battles take centre stage. If you're already a fan of Karas and are looking for more super-powered action, then you may find something to like in Zetman.