After the disappearance of her sister and finding out she had joined a suspicious enlightenment group seminar, Riko enlisted herself into the course to find her but the only way to reach the same course as her was to rank up and the only way to do so was to help others release… that being through sex.

Daisuke Ichijou goes on vacation to his grandmother’s beach resort. As he arrives, he admires the beautiful beach and even more beautiful ladies on it. Soon, he decides to start having fun “his own way.” He encounters many girls who will make this vacation unforgettable, including his old friends, the playful Nao Ihara and the wealthy Mitsugu Tsukushino, who proceed to compete over him. Daisuke also meets his cousin Maya Koromogae and her clumsy friend, Momona Amamiya. There are Kanae Shinjou and Mika as well, who also happen to “get involved” with Daisuke throughout his vacation. These six girls will be responsible for making Daisuke’s vacation intense, fun, and unforgettable. As they put Daisuke in many complicated situations, he finds that they often lead to passionate erotic activities.

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…”.

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…