Japan, sometime in the near future where a group of shinobi have been brought together and trained to deal with the demon threat that has persisted for some time. It has long been the case that demons and humans avoided each other, but that belief is about to be destroyed.

A continuation of Boku no Yayoi-san.

Distrustful of the changes she has noticed in Ikumi, Shizuka begins to investigate on her own, but is caught and restrained by Tanba! Trembling in fear at her impending confinement and humiliation, Shizuka looks on worryingly at the deranged man, who slowly approaches his untainted prey, drooling in anticipation. Thus begins a prolonged banquet of shame and disgrace. (Source: Coolmic)

Ziz's adaptation of Taimanin Murasaki (or Hell Knight Ingrid), the third Taimanin Asagi game by Black Lilith. 
 
Ingrid, a once feared and powerful Knight has fallen into the hands of a madman who has enslaved her body and mind. Forced to do the sexual bidding of her master with no ability to fight back she is broken and raped endlessly. 
 
(Source: hanime.tv)

Newly appointed PE teacher Ikumi Sunohara’s elegant features and curvy, athletic body makes her an instant hit with the male students. However, one man gazes at Ikumi with a strange, suggestive stare. The man is Shiro Yasuno, the same twisted creep who trained and turned Ikumi's best friend into a sex slave! He smiles suspiciously at the appearance of his new prey, Ikumi.One night, Ikumi searches the desk of Shiro Yasuno, whom she has suspected for some time, to find clues about her missing best friend. But just as she does, Shiro ambushes her, before quickly restraining her and knocking her unconscious. When Ikumi wakes up, she finds herself in a special "training room" that Shiro had built in an old school building! While trying her best to hide her uneasiness, Ikumi angrily curses out Shiro! Little did she anticipate the real horrors of Shiro's "training" were about to begin... (Source: Coolmic, edited) 
Note: Spin off of the erotic game by Black Lilith.

Desire for sex with next door neighbor's Aunt. making this young man who fell in love with a newly moved aunt. This wet dream and masturbation every day is done to vent his desire. Because of his curiosity towards the next aunt, he tried to peek and it turns out he knows a very surprising thing. 
 
(Source: Nekopoi and Has Been Translated and Edited)

Based on the adult game by Anime Lilith. 
 
The Taimanin Asagi series of erotic visual novels is a must-play for anyone who loves to see strong and sexy women succumb to the pleasures of the flesh. In this action-packed third installment, enjoy many hours of tentacles, monster sex, Ninja fighters, BDSM, and all sorts of other juicy fetish material starring the smoking hot Asagi and her demon-hunting ninja comrades. 
 
(Source: J-List)

Based on the erotic game by Lilith Soft. 
 
"Mana supply is a holy deed, so we're not embarrassed!" 
 
At Witch School, girls are trained to produce the best "mana supply" (sperm).
Sex is no mere leisure activity, nor is it a brutal affair.
Students are arranged in boy-girl pairs to ensure a constant supply.
Mana enhances a Witch's powers so she can battle the Eaters!
It's in everyone's interest that everyone master all kinds of sex technique.
More pleasure, better mana. Better mana, stronger Witch! 
 
* Boys supply the mana, girls absorb it; everyone is a pair.
Will you choose Rina or Alyssa? While living school life choices will arise
which affect sex scenes and the ultimate route with one heroine or the other.
Do well and you'll get a happy end. But with who? That choice is yours. 
 
(Source: DLsite English)

Based on the erotic game by Black Lilith & Anime Lilith. 
 
One year has passed since the Chaos Arena was destroyed, Asagi and Sakura were presently on an abandoned street on a man-made island that floated on top of Tokyo Bay. It was an enormous box-shaped island built by the government and referred to as "Tokyo Kingdom." 
 
There was hope that it would become a second city center floating at sea, but it had failed to attract businesses. 
 
The only way of getting to and from the island was through Honshu Island over the 10 kilometer Tokyo Kingdom bridge. Unfortunately, this narrow route was the means in which the inhabitants of hell found their way onto the island, luring anarchists, criminals, and even illegal immigrants there, transforming the streets of the sea bound city into a world-renowned haven for danger. 
 
However abandoned the streets were, order did exist in such a place despite it being a breeding place of crime. 
 
There was a business district at the heart as well as one of Asia's greatest prostitute grottoes. Whether or not it was only the strong who survived, the viability of living there required one not to be careless in making friends with the strong. 
 
(Source: Dark Translations)

It has been five years since Hiro's older brother passed away, and during those years, he has been living with his brother's widow, Yayoi. Fast forward to the present, Hiro's feelings for Yayoi is brighter than ever. 
 
Will he be able to confess his feelings towards her? Will Yayoi be able to reciprocate said feelings?

Based on the erotic game by Black Lilith. 
 
Yukikaze, a student at a ninja training academy, learns new demon-fighting techniques. One day, she and her friend Akiyama Rinko decide to infiltrate an evil organization in hopes of finding Yukikaze's mother; however, to do so, there is a great price they have to pay...

Based on the erotic game by Black Lilith. 
 
The stage is set in an abandoned city called Amidahara, inhabited by monsters, criminals and armed refugees. There lives Annerose, a female witch blade, who runs a private detective agency. 
 
One day, a girl named Miki comes by and asks Annerose for help in finding her brother. Starting from her request, Annerose gets involved in fierce power struggles between the dark forces in the city... 
 
(Source: DLsite English)

ZIZ Entertainment