Urara starts working at a girls’ school. She is now happy because she will get married in a few months. But one day, her fiance suddenly goes missing since his business didn’t go well. Months later, Yuji, a debt collector, comes to her house, but she doesn’t have enough money to pay. Yuji offers her to work at a boys’ school his friend works. He also says if she works there for a month, she won’t need to pay back money. She finally decides to accept his offer without knowing the fact that the school is full of evil teachers and students…

A cross over between the two hentai RIN×SEN and RAN→SEM. The story starts with Urara still being abused in the Kurodou institute. One day she is told by the headmaster that her fiancee, the one that set her with a great debt and only her body to pay for it, has been seen in the Believe lab. Luckyly, two lecturers at the lab, the Ichinose sisters Riko and Anna introduce Urara to the lab master, Majima. Then in a luxurious and grossly decorated room, Majima can’t stop licking his lips ogling the sexy Urara. He tells her she being chosen by god, and that she must enter the seminar to obtain answers. But, the seminar is a seminar in name only, nothing but free sex every day involving the poor Urara. One day Urara discovers the surprising reality from Riko’s mouth. The real name of her fiancee is Kaji, a lecturer in the Believe Lab. Furthermore, her senpai Asuka is also a participant in the lab. With a lascivious smile, Riko makes Urara jealous telling about Kaji having sex with Asuka. Urara walks into a playing room and sees Kaji and Asuka having sex. Urara screams in surprise and despair, in front of them she stutters back into a wall. With a misterious smile she finally breaks and murmurs ” Be… lie… ve…”.

Following an automobile accident that claims the life of his parents, Teppei Arima is taken in by his grandfather and introduced to the world of the rich and the elite. Compared to his humble upbringing, Isshin Arima’s lavish lifestyle surprises and stuns the young teenager. In return for the gracious hospitality, Teppei is expected to continue the family business by replacing his grandfather as the head of Arima Financial Combine, and to prepare him for these responsibilities, he is enrolled into an esteemed high school. Along with his recently acquired celebrity status and affluence, Teppei is informed of an arranged marriage with the equally prosperous Sylvia van Hossen, thus, beginning the thrilling escapades of his new life!

Haruomi Shiki’s peaceful life on a small island was shattered when a volcano erupted and destroyed his home. He goes to stay with a relative, where he meets the sexy sisters Natsumi, Akina, and Mafuyu Orifushi, who he immediately finds himself attracted to. While staying there, he finds out that the father of the Orifushi household has died, and that Natsumi inherited their ice cream business, MinMin. Their district holds an annual competition involving all ice cream stores, which MinMin always wins. But this year, a new ice cream shop called 101 opens a branch in the district, and they are a competitor that could beat MinMin. On top of that, the quality of the ice cream produced by MinMin has been significantly reduced since their father died. Will they be able to overcome such a handicap? Only time will tell, but with Haruomi helping the sisters with the ice cream shop, and also fulfilling his more salacious desires with them, he will have his hands full in more ways than one!

They wake up in a white room remembering nothing The protagonist Takato Keisuke and 6 others are locked up in these hidden white rooms. His childhood friend Hokari Kanae, classmate Ando Miyako, underclassmate Mikaba Rika, English teacher Aoi Natsuki, same year Byakuya Rinne, and classmate Manaka Nemu. While still confused about their unusual situation, a “mystery voice” suddenly speaks to them: “A game has now started. In order to escape the room, Keisuke is the “unlocker” and one heroine the “keyhole”. With an assigned act, he must “use the key”.

Flower, a local game design studio, finds itself on the verge of shutting down. After its first release turned out to be a complete letdown, the studio is now struggling to make ends meet. The employees of this all-female company desperately need additional hands to help them finish a new project on time. Tomoya Mochizuki’s passion is erotic games, or “erogames.” He can neither write scenarios nor program, and his artistic skills are quite frankly terrible. However, owing to his massive experience in the field, Nene Sonono—Flower’s director—decides to hire him as a consultant. The first thing Tomoya points out is that Flower’s employees have no sexual experience; thus, their scenarios and sex scenes lack in-depth and firsthand expertise. Eager to learn and develop their professional skills, the girls embark on a crash course to grasp the essence of erogames. Under the attentive eye of Tomoya, they explore previously uncharted waters of sexual pleasure—all for the sake of the company’s survival.

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…