College student Sawatari arrives at a lavish mansion for a high-paying servant position, only to discover that the "entrance test" consists of depraved sexual trials. After being subjected to the Mistress's whims, Sawatari and fellow applicant Mitarai are drugged and forced into a filmed sexual encounter, marking the beginning of their submission to the family's twisted desires.
Sawatari and Mitarai begin their rigorous sexual training under Sachie's guidance to prepare for an upcoming high-society party. Driven by their desperate financial needs, the two newcomers are forced to undergo provocative evaluations and endurance tests to prove their potential. While Mitarai struggles to cope with the intensity of the lessons, Sawatari falls under Sachie's dominant control, eventually becoming her personal plaything.
As the trainees undergo rigorous sexual training for an upcoming party, a rule-breaker faces a harsh punishment from Marika-sama. Meanwhile, Mikako reveals the debt that forced her into this life and enlists Sawatari's help for a provocative, unconventional "enema" to clear her system, pushing their intimacy to the limit before the final performance exam.
Mamiya hosts a decadent "carnal banquet" where guests indulge in drug-enhanced sexual fantasies and a twisted auction of human "items." The event reaches a peak of depravity with a public incestuous display between a mother and son sold as a sample to the crowd. As the party concludes, the cycle of exploitation persists, welcoming new arrivals into Mamiya's world of pleasure and debt.