Japan was engulfed in a demographic crisis, forcing the government to implement the "Ikumonogakari" law, which permitted promiscuous sexual interactions among the people. They started doing practical and pedagogical activities on the lessons of sexual life and a partner's sexual fulfillment. The protagonists are young and inexperienced, so practical exercises will help them to improve their skills.

Based on the doujin manga.

Takamura is invited to a fitness club by the wife of the managing director at her husband’s job. She goes and moves around her body. Just when she thinks she’s done, the wife says that things are just getting started. Onda is told by his upperclassmen about this part-time job so he goes to check it out. He goes for an interview, and then is told about the “special menu” the shop offers, which he decides to try out.

These 2 volumes consist of four short stories: "Mixed Bathing Hot Springs" Kaeda Endou loves hot springs more than romance, fashion and studying. "Cleaning Time" Miwa is a clean freak who can't stand the thought of being touched by others. "I'm Not a Virgin!" Thanks to her peers at school, Haruka thinks her being a virgin is the reason she's unpopular. "Look at Me" The landlord's daughter, Haruno, is very shy. She can't keep a conversation with her classmates.

Takahashi is roped into becoming the manager of the girls' volleyball club. He is inevitably used to gratify the sexual desires of all the club's members. Satou of the girls' volleyball club watches her senpai have sex with club manager Takahashi every day. She masturbates daily to quell her growing desires but to little effect. Satou devises a plan that buys her and Takahashi some alone time in a storage room. As their summer tournament approaches, the girls' volleyball club sets out on a trip to training camp. But as soon as the club memebers arrive, they throw a BBQ party! And after that, everyone wants some of Takahashi's cock!

Ema is a good girl living alone without parents. Only her grandfather remained who replaced him as Ema's father. They live together in a spacious house. With a perverted upbringing from his grandfather who was considered his father, Ema increasingly grows into a perverted person due to her grandfather's fanatical education and love

The main character in history, Hoshia-kun, recently moved to Tokyo. He loves stars and often watches them in the park. Once he met a tall girl who was naked under a coat. Soon he met her again when she transferred to his class. The girl was called Kaeko Momota and she explained to the hero her strange act. And all because of her growth and timidity - the girl wanted to walk around the park naked and liberate herself a little and get the courage.

The story focuses on little girls.

Implicity tells short intertwining stories taking place in the near future. The stories start in the upper stratum where the rich and successful lives, but we are soon taken to the slums where even semen are a vital source of protein for survival.

The first OVA is the story of a young girl and a young boy who looked up to her. She cooks well, she has big boobs and she is kind to you. Second OVA tell the story of the girl Tokiko, in the past she missed her school trip, and now decided to catch up on her own. On the way, she met a guy named Dai, who helped her get to the hotel, but it turned out that the girl forgot to book a room there for herself, and Dai begs the owner to let her spend the night in his room. All the time, Dai perceived Tokiko only as a clumsy simpleton, but after visiting her hot spring, he saw an adorable, sexy “girl” in Tokiko.

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The newlyweds had found a new house and went to greet their landlord, only to find that Murai, a former volleyball coach, had taken over the family business. Marin Momodate (maiden name) had bitter memories of Murai from her school days, and just as she was trying to avoid him as much as possible, she found him when she returned home after leaving the company on a long career break. Masashi, her husband, was put to sleep and the space was now just the two of them. The coach and she were sexfriends, and he rubs her tits as if it were a matter of course. Marin tries to refuse, but the past comes back to her, and she can’t forget Murai’s stubby, middle-aged body. Marin becomes addicted to each of his techniques, and her feelings gradually shift to becoming Murai’s female toilet.

Poison and malice in the name of sex. The petty villains lurking in the school and the student council that rules the scene. The resistance forces wage an information war against them. In this world, everyone has a hidden side.