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.

Satou Seiji’s life changed when his real lineage was discovered. He is the son of a rich man who passed away recently, and now Reiji is the new master of the Kamiyama house. But there is a catch! In order for him to be accepted into the house legally, he needs to provide an heir, and in order to do that, he must choose a wife from his very own harem!

Based on a game by Mink’s M no Violet division.

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.

Miyazawa Akina is the captain of a college softball team who has just hit a string of good luck. Her team has won the tournament, her love life is progressing well and her childhood friend has now become her boyfriend, and she recently won two tickets to a nearby hot springs. In high spirits, she fully intends to relax and celebrate her victories, but she might not be able to get much rest in such a romantic location, alone with the man she loves.

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.

After a heavy storm, Kazuma Shiraishi finds himself stranded on an uninhabited island somewhere in the Pacific. However, his situation may not be so unlucky, as 15 beautiful women are also marooned alongside him. Kazuma seizes the chance to have sex with these ladies, all while recording his raunchy deeds with three cameras he miraculously found lying on the shore.

Based on the game by Bishop.

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.

Led by their foreign female teacher, Suomi, the students of a certain high school set out on a trip to the Yarimoku nudist beach. There is only one rule the students must follow: it is forbidden to have erections. Hoping to create bonds between her students, Suomi pairs the female students with those who need to relieve their erections. Due to the visual spectacle provided by his classmates, Naotatsu Nagato is the first and only to break his teacher’s rule. However, Naotatsu’s seemingly insatiable lust proves to be problematic for his female classmates.

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.

Asa & Natsume are both in love with Hajime Saisho. Instead of fighting over him, they both promised to share him equally. However, both girls have to leave him by the end of the summer. As the summer days go by, they each spend their precious time with Hajime, while the day of their fated departure draws near.

While their parents are away on a business trip, the one entrusted with watching over his younger sisters is the big brother, Souichirou Nanase. Summer vacation has just started, and the siblings are bound to spend a lot of time together. However, Souichirou soon realizes that taking care of five adolescent girls—Michika, Koharu, Hiyori, Rio, and Aya—may be more troublesome than he expected. On top of having distinctive and quirky personalities, the girls are at that age when young women tend to experiment with their bodies and ask “those” questions. To make matters worse, Souichirou has a sister complex, and the five temptations walking around might be enough to finally break his moral barriers.

Having suffered an injury during a soccer game, Ryoushirou Hayasaki returns to his parents’ house to undergo therapy. As both of them are currently abroad, the only ones to welcome him home are his four older sisters—Yurine, Noemi, Naru, and Mio.

His laid-back recovery is soon interrupted when Noemi finds her brother’s erotic comics and love letters from younger classmates. The sisters soon realize that Ryoushirou has a little sister complex and the family argument that follows leaves the siblings at odds. Depressed and fed-up, Ryoushirou considers leaving the house. However, he gets an unexpected visit by Yurine that night—a short-haired and well-endowed beauty who is willing to help him with his rehabilitation and make up for the other sisters’ outburst. Unable to deny himself the guilty pleasure, Ryoushirou decides to make the most of his stay and take advantage of the wonders around him.

Arata Asaoka lives with his despicable, chauvinist father and older brother. A house of three men.

Arata was an illegitimate child. Bearing only a tenuous blood relation to the man who bastarded him into the world, he was treated like a second-rate human. With nowhere else to go, Arata suffered the cruelty of his father and brother for years. For years, he forced a smile and pretended happiness for the sake of strangers… One day he met the girl who gave him hope. Her name was Koharu Hinomoto. She was a ray of sunshine. Being with Koharu made Arata feel good, and he fell deep in love. He began to believe that his life could be better.

Arata decided he would move out and live with her. Even without money, they could make it work. Anything was better than how he lived right now.

Arata knew in his heart that he could make a warm, loving family with Koharu.

If he could just move out… before his despicable family ruins everything.

Our protagonist Tatsuya was living a normal life as a video game fanatic and altogether average guy. One day he stumbled upon a dark-skinned beauty being attacked by dogs in an alleyway… One thing leads to another and she ended up living with him as she had nowhere else to go… With nothing of her own, she can only think of one way to thank him for his kindness…

Dude has to impregnate every single chick in his high school to save them. From what you ask? Fuck knows. As a wise man once said – Fap first, ask questions later.

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!