Yukari Masaki

The female instructor Mariko gives yoga classes at a high-class club in Tokyo. She has a crush on Rika whom she gives private lessons to. When she notices bruises on Rika's body, Mariko learns that the young woman is involved in a highly abusive S&M relationship. On order to gain the affections of her student, Mariko decides to take revenge against the men in Rika's life.

"There are no onago that I can't catch!!" A big game of sex demons begins over the phantom "naked mermaid"

Keisuke, an obstetrician-gynecologist, has lived with his son and daughter-in-law and run a sex clinic since his wife passed away. His daughter-in-law, Keiko, is a rarity these days: she was a virgin until her wedding night. Her husband, Yuji, suggests she consult Keisuke, as she has yet to experience real sexual intercourse. The following evening, Keiko calls Yuji, who has traveled away for a medical conference; however, he is in the middle of an affair with an office worker he met online. A few days later, Keiko decides to undergo an examination by Keisuke.

Mika, a woman entirely devoted to her work, satisfies her sexual desires through masturbation every day. She loves sex; simply witnessing a young woman named Mami being hit on by a man named Tatsuo on the street sparks wild fantasies and leaves her body burning with arousal. One day, Tatsuo approaches Mika herself. She immediately invites him back to her apartment, drugs him with sleeping pills, and has her way with his body. She even puts a collar and handcuffs on him, effectively keeping him as a pet...