When Rinka runs away from home to stay with her uncle, she becomes the target of his dark obsession. Driven by a fixation on her father's partner, the uncle uses a potent drug and psychological manipulation to assault Rinka. After a night of abuse, he leverages her fear of pregnancy to ensure her continued compliance, trapping her in a twisted cycle of control.
On the second day, Rinka is subjected to further humiliation and abuse by her uncle, who forces her into feminine clothing and coerces her into degrading sexual acts. Using the threat of withholding medication and the effects of an aphrodisiac, he pushes her boundaries further, eventually forcing her into a public encounter with a stranger to ensure her total submission.
On the third day of her torment, Rinka is subjected to extreme humiliation when her uncle forces her to endure a grueling test of bladder control. After she fails, he uses blackmail and recordings to coerce her into degrading sexual acts, eventually staging a traumatic encounter with a patrolman to completely break her spirit and push her into a state of total submission.
After fully corrupting Rinka, Ryuuji returns her to her parents' home, where he turns his attention toward her mother, Haruka. In a bold display of dominance, Ryuuji seduces Haruka and engages in sexual acts with both women in front of his brother, aiming to dismantle the family's stability by claiming both women as his own.
Ryuuji returns home to be served by his brainwashed slaves, Haruka and Rinka, whom he has manipulated into submission using aphrodisiacs. To further exploit Rinka, Ryuuji forces her into prostitution, promising her sexual rewards for her compliance. As Rinka begins selling her body to strangers, she finds herself caught between the thrill of new sensations and her obsessive desire for her uncle.
Under Ryuuji's manipulation, Rinka begins working as a sex worker to prove her eroticism and earn his approval. When her father arrives to rescue her after Ryuuji claims to be bored of her, Rinka instead seduces her own father, fully embracing her new identity as a harlot. Ultimately, Ryuuji reveals the ordeal was a test to further break her spirit and reclaims her for his own pleasure.