College student Riona is invited by her friend Saya to take on a high-paying caregiving part-time job, which she can't bring herself to refuse. When the two arrive at the client's home, they're initially relieved by the kind and beautiful wife who greets them. However, they soon realize the household is inhabited by a couple with bizarre sexual fetishes. The elderly man insists on eating meals mixed with women's saliva, and shockingly demands young women's urine and feces. Though confused and hesitant, Riona and Saya continue the caregiving under the wife's perverted instructions, only to find the situation escalating further and further out of control.