Shibazaki-san wants to release an eroge, and she will need the help of her friends, as well as the shy Mikoshiba-kun. What can we expect at the end of this erotic book?

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

Shuntarou is an average high school porn addict. His sexual desires are directed toward his younger sisters, who he deeply adores in a way no older brother should. He even resorts to stealing their underwear and satisfying himself to it, for which they deeply despise him. His only wish is to have a caring and kind older sister who would be the complete opposite of his mean siblings.

After one such session with young women’s panties, Shuntarou spots a mysterious new video game on his computer. Although he has no recollection of ever downloading it, the title “Older Sister Week-Long Experience” sounds too alluring to pass on. While the game seemingly does not start, the next day he finds himself shrunken to the size of an 11-year-old.

When his sisters discover him, he introduces himself as Shuntarou’s internet friend Koharu—and the girls instantly fall head over heels for his adorable and innocent appearance. Koharu quickly takes advantage of the situation and subjects himself to the tender care of his oblivious, now-older sisters.

In a last-ditch effort to lose his virginity and die right after, Takeshi draws a demonic circle in hopes of summoning a succubus to wring him dry. He successfully calls upon one named Miyu, however, she is also a virgin—completely inexperienced with her sole purpose. While Miyu’s best efforts to please Takeshi to the point of killing him are not fully effective, perhaps the unity of these two virgins can help them realize their true destinies.

Meanwhile, a man named Shuu has recently moved to a new apartment where he notices a blonde doll sitting above his closet. Following the decision to take care of it out of fear that a curse will befall him if he disposes of it instead, he finds himself brimming with good luck. Eventually, the doll assumes a human form and introduces herself as Nina. As if things could not get any better, she promptly proceeds to alleviate Shuu’s sexual desires.

In the future, where sex is no longer age-restricted, a young married couple lose their wedding ring – which gets picked up by a teen prostitute and her boyfriend in the slums. She wants to sell it and use that money to start fresh but, as it turns out, that won’t be as straightforward.

“The content of this video is not real, nor is it subject to any situation of daily life, all characters are fictitious.”

A side story from the original: Ai wishes to be a real woman, after thinking that she had dreamed her sister doing with the doctor. On the other hand, Ryuji Hirasaka wants to have his pervert experiments trial on Hikaru. Instead, the doctor become a savior to Hikaru & Ai for his new invention having both sisters doing it to one another and Ai thought that it as a dream… The last episode ends as the doctor and his newly wedded bride nurse, Ren, went exile to a village to continue his medical practice… and of course his experiment only on his bride.

Sora was lying in front of a hospital. He was seriously injured, and when he was about to die, a nurse, Yamami Yu, helped him.
He was sent into an emergency ward, and he met a beautiful woman, Mikage Reika. She was a director of the hospital, and she asked him to become a test subject. Because he didn’t have any relatives, he accepted it. Then, Yagami Yu was supposed to take care of him.
Since that day, his fate had changed a lot.

On a forbidden hospital ward, the head doctor performs madly erotic experiments, stripping the nursing staff of their uniforms, inhibitions and self-control… until even he is shocked by what he uncovers!

After living with his grandparents for 10 years, Yuu Shirakawa moves back in with his mother. As it turns out, she has remarried. Her new husband has three beautiful, young daughters who are now going to be Yuu’s stepsisters. Due to the nature of his work, Yuu’s now-stepfather is often away from home, leaving the house to his children to use as they please.

As he settles in his new room, Yuu notices a mysterious package addressed to him. Inside, he finds a glass bottle labeled “Vial of Inanna,” which apparently contains a deadly curse he is now afflicted with. The only way to lift the curse is to collect a significant amount of female bodily fluids while leaving their owners unaware of its existence. As horrible and difficult to fulfill as that may sound, Yuu soon realizes that the presence of three more-than-willing-to-cooperate girls in an empty house might be helpful.

The hero of this story is Takashiro Shugo. An ex-police officer that is now unemployed and freeloading at a brothel. From time to time he takes on detective work from his former superior. As the story starts off, a missing persons case is dumped onto him. The person he is supposed to find is Kohzuki Yura. A girl he had an intimate relationship with before being sent off to war. While all this is being played out, a series of brutal killings occur in the background. As they strike closer to home, Shugo is no longer able to turn a blind eye and is dragged into the spiraling web of events.

Tatsuo is a skilled masturbator who suddenly dies from masturbating too much. After dying, his soul was transferred to an isekai. An isekai goddess grant him a wish, then Tatsuo told him that he wanted a super cock that could make all women sigh with pleasure and make all women unable to live without it. He wants to make a harem with women who are already addicted to his super cock.

On the first day of his residency at the hospital, the first step to fulfilling his dream of becoming a doctor, Takuya met his childhood friend Mio for the first time in many years. She was now a nurse and showed him around during his busy training days.

One day, he fell down the stairs while protecting her and broke his right arm and left leg. As a result, his residency was put on hold while he was hospitalized. He was placed in Mio’s ward and she felt responsible for the accident. To cheer her up, he suggested that she could take care of him whenever she has free time, to which she readily agreed. It is the beginning of a hospital love story between a medical intern and a nurse who would go above her duties to take care of him.

The story of young Rachel is a sad one. Orphaned as a small child, abused by a jealous rival, and the object of lust by those who are supposed to be caretakers, she still tries to maintain a positive attitude about her future. Aided by her only friend Beth, her budding romance with Prince Andrew falls under jeopardy when a distant relative whisks her away for purposes unknown.

Yuu Arahama has a girlfriend named Misako Shimizu. She has a great body and loves him greatly. One night, after having sexual intercourse, Misako proposes to Yuu. However, he rejects her proposal, revealing that Misako isn’t his only partner. He has four other partners: Ryouko Yanagi, Kotori Hoshino, Makiko Endou, and Aina Kamishima.

Misako makes Yuu call all four of them at once, only to find out that each girl is not aware that Yuu has sexual relationships with the others. Another problem arises when the girls decide to compete with each other so as to determine whom Yuu is going to choose as his wife. However, Yuu is reluctant to marry anyone, fearful of the possibility that he will lose his freedom when he gets married.

Now, Yuu has to go through various situations which forces him to go through sexual activities with the girls to sate their lustful desires and settle their feud.

During summer holidays, Katsuragi reports to the Tsubaratera household to work as a butler in accordance to his grandfather’s will. There, he meets the spoiled and willful Tsubaratera Kotoha.