The fiendish gun to which that makes the person deviate whom it has, continues to inhale no human thing blood. 
A certain day, Asakura superior obtains that gun accidentally. In the bag where the gun has entered the mass cash and video of request for the assassination by the person of puzzle... the owner of the original bag was the hit man who is called the hunter. 
It faces to the actual place of assassination, as a hunter uniting with the woman angel of puzzle superior, there, he means to assassinate the target. 
As for superior, selecting one some kind of destiny? 
And, as for this dangerous game expecting first death, or... 
(Source: AniDB)

Based on the erotic game by Active. 
Bible Black Only explores the sexual misadventures of the supporting cast from the main Bible Black series. Miss Takashiro reminisces on her demonic capture, Itoh reveals her sadistic side, and Saeki is stalked by her classmates. Bible Black Only is a series of stand-alone episodes that do not affect the continuity of the main Bible Black series, and it contains footage that was previously only available on the R2 Bible Black Perfect Collection DVD.
 
(Source: Anime News Network)

The story revolves around Takuro Hayami who transferred to the mostly female Saint Arcadia School. Seemingly all of the girls want to have sex with him because the school only recently started admitting male students. Takuro seems like a normal student, but what the girls later realize when they try to take advantage of him is that he has a secret. Takuro has an "Ultimate Sex Power" that becomes the focus of St. Arcadia's sexual power struggle.

Based on the erotic game by Active. 
Several years have passed since the Walpugis Night incident and several bizarre serial murder cases have occured in the metropolitan area. Dead bodies of couples are discovered murdered during sexual intercourse. The women didn't have any external injuries, but the men were completely burned and carbonized except one part... their genitals. To solve these bizarre incidents, a special detective team called "Tokken" is deployed. Included amongst the members of Tokken is Imari who had experienced the events of Walpugis Night. While investigating the incident, they found a mysterious phrase, "Spear of Longinus," and a strange cult group that is related to the incidents.
 
(Source: Anime News Network)

Based on the erotic game by Active. 
Twelve years prior to it's discovery by Minase, the origins of the magic book with dark,sensuous powers is revealed. Initially owned by a female student, Takashiro, who, along with other curious students form the first magic club on campus. The club begins to use the erotic spells to carry out favors for fellow students, and vengeance. After underestimating the powers behind the book, Takashiro is taken out of the picture, as a new leader guides the club towards a darker course, one that will force school newcomer Kitami to make a dire choice.

Based on the erotic game by Active. 
Minase, a high school student, found a book of magic in an isolated room in his school. He started practicing black magic that has extreme sexual effects that benefited him and some of his friends. Intrigued, Minase got deeper and deeper into using the craft, not realizing the evils that will come forth. Eventually, the origins of the book was revealed, and so did the incident twelve years ago on the night of the Walpurgis, the night when the power of evil is at its strongest. After coming to his senses, Minase struggles to get himself out of the darkness that he had put himself into.
 
(Source: Anime News Network)