Toshio Maeda

In this sequel to Urotsukidoji: Legend of the Overfiend, the unbelievable sexual violence of the Overfiend and his cohorts from Hell continues to wreak havoc on the earth. Who can stop this relentless onslaught? (imdb)

When Overfiend is found and born in a human, he will remake the world to something more of his liking! Ripping the boundaries of the three universes (worlds) apart, it's clear that little can stand in his way! While the other worlds are hoping to find the Overfiend to control the creation of this new World we call Earth. (imdb)

Created by Japanese comic artist Toshio Maeda, Urotsukidoji opens up the mystical demonic truth of the darker realms of imagination.

Amano Jyaku is searching the earth for a being known as the "Overfiend", who is scheduled to appear and create a new eternal paradise. He thinks he's found the dormant being in a Japanese college student, but a demon warrior is intent on preventing the young man from reaching his potential. Will Amano be able to protect his discovery? Should he? After all, if the Overfiend is here to create a new world, what's going to happen to this one? (imdb)

A direct-to-video hentai short featuring ninjas killing people and hardcore sex.

Sex Ninjas Must Die! Miko Mido answers the call of the wild, to become a mistress of martial arts sexcraft! In these erotic episodes, Miko discovers that she is the last in a line of supernatural sex ninjas. Now, this delectable demon slayer is all that stands between humanity and the perverted hordes of the underworld. It won't be easy - these depraved demons are ready to turn a few tricks of their own. It'll be a whammin', slammin' battle as she thrashes the monsters in carnal combat! (imdb)

Basically the Chojin (god of gods) has been born and has told Amano Jaku (man-beast) that he must protect him from his evil adversary Kyo-oh. Meanwhile the rest of Japan is ruled by the cyborg tyrant, Caesar, who craves power & women as his sex slaves. (imdb)

During an archeological expedition to a forbidden Himalayan temple, 19-year-old Masao Sera stumbled upon a bloody, sacrificial rite designed to throw open the Gates of Hell. Meanwhile, a dark force has descend upon Masao's college. Fights, gang violence and rape are the order of the day. But now, some of the gangs have started to develop supernatural powers and unholy appetites. (animenewsnetwork)

An immortal beast-man of supernatural lusts, Amano Jaku escapes prison to gratify his appetites at Meishin College. But the campus is not just a hotbed of luscious coeds - it's the breeding ground of a hideous monster! The Ultra God is Amano Jaku's nemesis, a vile killing machine and the ancient harbinger of the coming apocalypse. Now, immortals will clash in a battle that will bathe the Earth in innocent blood! (Amazon)

The story as such concerned the arrival of the real Chojin as he/she (a hermaphrodite) makes moves to wipe out all life on Earth. (Rotten Tomatoes)

From the radioactive emptiness of space comes the Demon Beast. A hideous alien monster, the Beast shares a psychic link with the beautiful Earth woman, Kayo. Bound by a forbidden past and a horrifying erotic encounter, she is destined to lure the Beast back to a helpless Earth. Her tortured soul cries out across dimensions, calling the Demon Beast to begin his reign of bloodlust, carnage, and terror... (animenewsnetwork.com)

From the radioactive emptiness of space comes the Demon Beast. A hideous alien monster, the Beast shares a psychic link with the beautiful Earth woman, Kayo. Bound by a forbidden past and a horrifying erotic encounter, she is destined to lure the Beast back to a helpless Earth. Her tortured soul cries out across dimensions, calling the Demon Beast to begin his reign of bloodlust, carnage, and terror... (animenewsnetwork.com)

Shin Injuu Gakuen (2 episodes, 1993) adapts the end of the manga, and as such is a follow-up and the conclusion to Miko's adventures in the first series. This time the enemies are Fubuki Kai, a rogue ninja who wants to defeat Miko and claim the title of best ninja, and the cybernetized survivors of the Suzuka clan. (wikipedia)