With the company on the brink of bankruptcy, the defiant president Echizen plans to do something foolish one last time. He sets up a lab he calls the "Orgasm Research Institute" and begins research into ecstasy with the researchers he has gathered. First, there is the interaction between Teruha, nicknamed "the 10,000-slayer" who charms men with sex, and Youji, who has a big dick. The excitement of the researchers reaches its peak when they see this. Then, they take turns to conduct dizzying experiments on pleasure in the isolation facility! What on earth lies ahead?!

Nami is a freelance nursing care helper who will do anything for her caregiver. At the request of Nagara, who runs a women-only share house, Nami visits his house, where she meets Kyoko, a legendary mat player, and Sayaka, a woman who drives men crazy with her gaze. The three strongest people come together and improve each other's skills and sensitivity, but...

Akiko, Haruka, and Fuyumi, all married women living in a housing complex, are living unsatisfied lives as a married couple. The three of them learn about each other's existence after Haruka posts something on the internet. Haruka suggests swapping to Akiko, but Akiko's husband, Kuriichi, doesn't understand, so she goes out alone to play with Haruka and his wife, where she awakens to a new self...

Medical student Hirotake was fascinated by photographs of figurine dolls depicting various sexual positions. As he and his girlfriend Mizuki engaged in sexual activity in the same poses as the dolls, Hirotake became aroused and begged Mizuki to become a doll with him. Hirotake was captivated by the perfect body of Reimi, who bared her own body in an attempt to break free from his obsession with dolls and lead him to love for humanity, but...

Kisaragi and Yayoi, sisters who lost their parents in an accident at a young age, were placed with different relatives and raised without even knowing of each other's existence. While Kisaragi was raised like a true daughter, Yayoi was taken in by an elderly man named Mamiya to settle a relative's debt and is now set to marry him. Upon receiving a letter from the old man and learning the truth, Kisaragi travels to Tokyo, determined to call off the marriage and take her sister in—but...

Shy Kyoko is on the verge of marrying her fiancé. Meanwhile, her younger brother Kazuo—who has a delusional obsession with his sister—plans to sabotage the wedding. However, their father suddenly passes away, and relatives rush in hoping for an inheritance, only to discover the will asks them to renounce their inheritance due to massive debts. Seeing this, Kyoko postpones her wedding and vows to protect the family home. Kazuo is delighted by the postponement, but one day, Kyoko falls and hits her head, causing her personality to undergo a drastic change...

A book that claims that housewives are livestock kept by their husbands has become a hot topic. The author is Eri Kawamura. Housewives Tamayo and Hiroko are enraged by this claim and approach Eri's mistresses with the intention of blowing a bubble with Eri, but... The second installment of the series by Sachi Hamano.

Yomogi runs an moxibustion clinic called "Yaito-ya." She first experienced that sensation—a mix of shame, pain, and pleasure—when her father's new wife applied moxibustion to her. Since then, that humiliation has become essential to satisfying her sexual desires... and she continues to spend her days chasing after that very pleasure.

The old Bizan family. Samon, the head of the family, his older brother Tamio, his wife Fumiko, and his younger brother Takuichi, who was adopted by his relative the Koga family, and his wife Yuko. Freelance writer Sumie was hired to write Samon's biography. Samon, who had fallen in love with her before he knew it, proposed to her out of desperation...

Rumors were circulating that obscene medical examinations were being conducted at Murata Memorial Hospital. Seishi, who works for the Ministry of Health and Welfare, infiltrates the hospital to find out what's going on. There, his girlfriend Rin worked as a nurse. Okada, an inpatient, said that if he had a certain card given to the nurses, they would remove the accumulated material, and that the longer he stayed in the hospital, the more special treatment he would receive. That night, Seishi sneaks into Okada's room and sees him being serviced by a nurse. And he had a suspicion that the other person was Rin. Before long, Seishi was to receive the highest quality paradise treatment. Seishi uses sleeping pills to put Okada to sleep and enters the treatment room in his place, but...

Believing he has killed his sister, Toshio flees in panic on his bicycle toward the remote mountains of Okutama. His devoted lover Kenzo follows closely behind, desperate to stop him from falling into despair. Lost and broken, Toshio wanders into a secluded "free-love zone," where he sinks into reckless encounters and hollow desires. As guilt pushes him toward a fatal decision, Kenzo races against time to reach him. Will love save Toshio before it's too late, or will this forbidden journey end in tragedy?

Tetsuro lives a quiet and steady life, with cycling as his only passion. But after dreaming of a translucent jellyfish, his world begins to shift in unsettling ways. What starts as small disruptions soon escalates—intimacy falters, and his beloved bicycle is stolen by a mysterious cross-dressed man. As he chases after the thief, Tetsuro encounters a series of enigmatic figures, drawing him deeper into a world where reality and illusion blur beyond recognition.

One day, Oshio found himself having sex on a rocky beach with a man he met at a party without realizing it. It was as if the party itself was a dream. He found himself surrounded by men in camouflage uniforms, SM, cross-dressing, orgies.... So many things came at him one after another... He woke up from the dream, but it was still a dream. It's like a dream that never ends. Is this a nightmare?

Editor Kurumada is in charge of the popular author Hara. When he receives a call from the capricious Hara and goes to retrieve the manuscript, Hara hugs his wife, Mariko, in his study as if to show off to Kurumada. Even though Kurumada suppressed her rising anger, Mariko's foolishness still stuck in her mind. Afterwards, Kurumada is invited to Mariko's home and begins a relationship with her. The incident was videotaped by Hara. Hara claims that he has the right to embrace Kurumada's wife, Yumi... The second work in the series depicting the sexual behavior of a married woman who indulges in swapping.

Hiromi Katori, a new employee, felt unwell during work and went to the infirmary. Then, instead of the usual Maki Kitagawa, the person there was Hanako Minamida, a flashy middle-aged stranger. Hanako tells her girlfriend Katori that the nervousness of her trying to force herself to apply to the company is causing her to lose her mental and physical balance. While telling him that she doesn't have to be useful to the company and that she should not lose her individuality, Hanako gently places him on the bed and takes her dick in her mouth.

Two brothers live in a fine house that was left to them as an inheritance after their parents died. The older brother is a medical school student, and the younger brother is a law student. However, the younger brother doesn't seem to be able to rely on his older brother's academic ability. Worried that if things continue like this, he won't be able to graduate or even become a doctor, he decides to ask for an excellent private tutor. The tutor who came was a very beautiful woman, and she said that her brother's lack of confidence was due to his virginity, and that she would teach him both studies and sex. The younger brother is stunned, but he is told that he will introduce his younger sister to you, and when she arrives, he is taught how to have sex. And the tutor sisters end up living with the brothers at home. SEX lectures are held every day in the house. Eventually, the sisters' mothers and fathers come and live with them...

Yoneda, an elite mayor, was well-liked and devoted to reforming the city's administration. One day, his daughter brought her lover Shiomi to her house. Yoneda and Shiomi stare at each other, and their love begins. Mayor Yoneda is having trouble dating his daughter's boyfriend. However, she sees Shiomi's motorcycle with a strange man on it. Yoneda, jealous of her, summons Shiomi during her office, and she confirms her love in a deserted riverbed. Those days won't last long. Her daughter sees her hugging Shiomi...

Takeko was an ordinary married woman whose daily routine was to keep a diary. Takeko falls into a delusion due to her diary and begins to desire the body of a barbaric man...

Yuka, a female college student, is obsessed with delusions of herself being raped and is unable to go to university. She cannot escape the feeling of intimidation that the men around her are attacking her. Her mother, Kikumi, sends her Yuka to her psychoanalyst, Kurahata. Based on what Yuka says, Kurahata deduces that the biggest cause of Yuka's mental imbalance is likely to be her conflict with her mother, Kikumi. Kikumi is flashy and stands out no matter where she is, and apparently she has taken Yuka's first love, Kunisaka, a masculine schoolteacher, as her mistress...

Tomorrow is her husband's 77th day. Ayako strips naked in front of her urn containing her husband, and she suddenly makes a decision to put on her mourning clothes. Ayako's late husband, Jiro, was jealous, sadistic, and insidiously bullied her. Even in the bedroom at night, Jiro becomes abnormally excited by being jealous of her friend Katsura and blaming Ayako for her unrealistic delusions. From Katsura, who came to pray on the 77th, she heard about her husband, which Ayako did not know. "He was the only person she could call her best friend..." Ayako recalled that day's affair with her husband. It was sex that could be called painful...