Based on the doujin manga by Joy Ride/Yorokobi No Kuni.

Konna Mune demo Aisaretai!! (These Breasts Want to be Loved, Too!)
High school student Ookoshi discovers the secret of his well-endowed classmate, Takita—it turns out that Takita does not have the breasts that everyone around her believes her to have. Fearing that Ookoshi may expose her secret, Takita “gives” him something irresistible as an incentive.

Souda Imouto to Renshuu shiyou. (That’s Right! I’ll Practice with my Sister!)
After arranging a meetup with a girl online and thinking that it may escalate into something lustful, Ami’s older brother decides to practice having sex with Ami. Of course, she is not willing to let her brother have his way with her, unless he completes a certain “challenge.”

Kaoru-kun is a young man who has just declared himself and starts dating his childhood friend Mako-chan, she is a girl who loves to masturbate and can’t wait to have sex. But maybe Kaoru-kun won’t be able to be his first man in time…

She was a pretty girl you might find in any town. Most people would look and see an innocent. Not one guy. One guy imagined her begging, tearful face and got aroused.

He didn’t even realize how deep his sadist desires went. He began to stalk her. He looked for anything to feed the fantasy that she was a dirty whore. A justification. And then, a single DVD arrived in the mail.

The DVD was a secret gathering in the home of a wealthy family,
where adults helped themselves to a young girl. The young girl was Sayaka. The sex was rougher than anything he’d ever seen.

Several days later, the person who sent the DVD
made a request. “I know who you are. I want an amateur with your sort of perverse interests to do some training.”
A drug was provided. It was a drug used to make the gathering video. Sayaka lived for it. She existed to taste it.
Her hunger for the drug made her beg and plead…
The desire that marinated his sadist heart now aimed at her.

The main character is a senior who attends Rinin High School; the only school among the mountain town of Rinin City. The main character, who is the student president of the high school, has another hidden persona. The persona as head of the “Gang Rape Club”…

A dark ceremony existed that had been handed down for thousands of years in the old town of Rinin; the name of the ceremony, in particular, in the oldest of records. That ceremony, enacted to protect the region from disease and crop failure as a curse from the region’s guardian deity, Hime Iwanaga, occurs in the evenings between the new moon and full moon, in which a maiden is disguised as Konohanasakuyabime and gangraped to appease Hime Iwanaga’s anger. In regards to the maiden, there must be an important man participating in the gang rape, in other words, that man must be related in blood to their wife or lover, mother or daughter, younger sister or older sister, and the like, and after the gang rape, if a pregnancy occurs, Hime Iwanaga’s anger is abated, and a good harvest and safety upon the region will be promised. However, if a pregnancy does not occur for the sake of suppressing Hime Iwanaga’s anger, the maiden is supposed to be covered with semen, and floated down the river alive, as a sacrifice.

And now—After the Tashio era, the ceremony itself had vanished into the dark history, but had still continued on at Rinin High School; the cruel, improper traditions being inherited over into a secret society through actions carried out by the Gang Rape Club. For generations, the student president of the High School has served as the head of the Gang Rape Club, not allowing even one day to pass uneventfully, submerging numerous women to the dark, suffocating pleasure.

Due to a school conspiracy, Tetsuya is forced to drop out of school. In order to satisfy his need for revenge, Tetsuya needs to get his hands on Haruna, the principal’s daughter. However, to do that, he needs another to girl to lure Haruna out. That’s where Ayano comes in…

Futoshi is fat, smelly, and ugly, so he is teased and bullied by other students. But one day, he receives a parcel from his father who is an inventor. He opens it and finds a cell phone. According to his letter, he can hypnotize anyone using the cell phone. He is doubtful at first, but he visits a woman, Sayuri, who lives next door and tries it…. Yes, it works perfectly. He now plans to take revenge on the students who tease and bully him….

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…

Saiki Yasuo is a 45-year-old office worker. After 20 years of marriage, his wife asked for a divorce and left him. Now, depressed, he spends the nights drinking alone, until one night a girl from the St. Marian Academy approaches him looking for a client.

Jun and his teacher Katsuko Kurose are in love with each other. One day, Kazuya Shinohara sees them together in a classroom and blackmails Katsuko to have sex with him. She begins to enjoy it more and more. Will she hold on?

Kyouko has incestuous feelings toward her son. The story slowly progresses into the son realizing his own feelings toward his mom. Later on, a friend of her son’s, Shin, blackmails her into doing whatever he wants. Slowly, she starts enjoying herself more and more. Will she break or fall for her son?

The plot revolves around a boy whose mother left him with her friend to look after him or babysit him.

An ordinary high school student feels pressured to lose his virginity to Bitchko, a girl considered to be the school’s prostitute. However, the boy’s secret crush, Yariko—the most popular girl in school and a model—proposes the unexpected: she wishes to have sex with him, as she aspires to sleep with one hundred virgins. With such bizarre run-ins seeming endless, he starts fooling around with multiple female classmates, becoming the sexual icon for all the girls around him.

Based on the adult PC game by Orc Soft.

After five years Kenta returns his former house.
Now his uncle’s family lives there and he is supposed to stay there again because he plans to attend the nearby school.

That means he’ll meet his older cousins, twins Saki and Maki , again who used to take care of him when he was younger.
But to his surprise Saki and Maki have grown into very outgoing girls.

Kenta quickly learns that his uncle got transferred to another city so it’s only the three of them in the house.
Saki and Maki waste no time to approach him very aggressivly.

Suddenly rushed to the hospital our hero reunites with a girl he knew once upon a time. Seeing them growing closer makes the Nurse who is overseeing them want a part of the action as well…

Our hero can’t seem to keep his hands off of either of these nurses… and neither can anyone else…

Hajime Tanaka possesses powers quite unlike that of other students. Thanks to his hypnotic abilities, he can impose his will upon any individual he comes in contact with. He uses this skill to convince a government official to appoint him as a “Sex Counsellor.” Consequently, his word is absolute when it comes to sexual matters. Instituted by his new jurisdiction, every couple must undergo counseling under Hajime’s watchful eye before engaging in any form of romantic activity.

The first couple to visit Hajime are Yui Obata and Daiki Tachibana. With unwavering hypnosis-induced faith in their Sex Counsellor, Yui subjects herself to the careful inspection of Hajime. Meanwhile, her boyfriend watches them attentively and records their intercourse so as not to miss out on any precious snippet of wisdom.