Three students are in a school late at night fighting supernatural enemies. As they are about to leave, they get attacked and trapped. Based off the Inyouchuu game.

This story about a married woman, as is usual in such stories sexually unsatisfied in married life, and decided to make up for lost time with her brother, who came to stay with her husband and children. What started as a harmless joke on a drunken bench, will grow into a constant frenzied sex always and everywhere, at any convenient opportunity.

Yuuta Yamauchi is an average high school student preparing for exams through his summer vacation. His older cousin Kei Higashide, who takes pity on him as her “little brother,” devotes her time and patience to tutor this relative in need. One day, Yuuta manages to take a photo of his classmate and crush, Youko Kaji, as a gust of wind lifts her skirt. When Kei finds out about it, she laughs at Yuuta’s juvenile infatuation and starts teasing him about his sexual preferences. From words to deeds, she offers him her own grown-up body—and Yuuta quickly takes advantage of the opportunity. As summer passes on and the relatives start enjoying more time together, their initially bland tutoring sessions soon turn into a passionate and fiery relationship.

Seika Girl’s Private Academy has a dark secret. All of the girls at this school are from prestigious families and thus have never dated… even once. So the school had to come up with a way to make sure they didn’t get too overwhelmed by their urges..

Every school has secrets, but few leave a stain that won’t wash out. In a certain school, there was once a fun club centered around magic but had turned into murder and a lust for power. Sealed and willfully forgotten, the resulting evil of that day remained chained in the school’s basement. Twelve years later, high school student Taki Minase, while inspecting the place where the incident took place, uncloaks the secret plastered in blood—a book of magic called “Black Bible.” Trying his luck with its love curses, he soon finds out the magic proves real and easily penetrates the hearts and bodies of his fellow classmates. The resulting intercourse leaves the student body very vocal, and Minase’s acts do not go unnoticed. What was at first a simple stroke of curiosity becomes much larger and harder to control. Fully swallowed by the unshackled darkness, everyone he knows becomes a victim, including his childhood friend Kurumi Imari. Torn apart, Minase finally realizes his mistakes and that he must reverse them in time if he ever hopes for him and Imari to come together.

Ever since he was a kid, women have bullied Boku, which marks him so that he stays stuck in the past and becomes unable to move on with his life. One day, his childhood crush, Kasumi, invites him to her wedding. As he watches everyone around him lead a happy adult life, Boku realizes he has been left behind, causing him to wish he could start his life all over again. Somehow, this desire comes true, and he ends up traveling back in time to his preteen days. He soon meets Sera Narumiya, his past neighbor, who frequently harassed him throughout his school days. Given an opportunity to redo his life, Boku decides to confront his past problems, but now with the mentality of an adult—this includes, of course, a more sexual approach when dealing with troublesome women.

Ryouichi goes to his friend Yuu’s place to play video games, like they do sometimes. It turns out that Yuu’s aunt Yui has come to visit, and she joins them. But it soon becomes clear that it’s not a video game she wants to play with Ryouichi…

After their rejected request to create a formal student magic club, Hiroko Takashiro, Saki Shidou, and Rie Morita are forced to continue practicing witchcraft in their free time only. One day, Rie comes across a dusty, hand-written book. Found on a sales pile in an antique shop, the manuscript seems to be nothing more than a foreign curiosity. Upon translating the book, the girls discover simple spells designed to bend an unsuspecting victim to the user’s will and impose one’s sexual desires on them. Realizing they have come into possession of a mighty weapon, the group begins fulfilling different requests of other students—be it for love, vengeance, or sexual desire. As the situation spirals out of control, the magic club gradually transforms into a cult of blood, lust, and human sacrifice.