A normal high school girl, Chiharu, raised in a deeply perverted family. Since childhood, she has been sexually involved with her father and brother, accepting it as perfectly normal. However, she gradually begins to feel uneasy about her bizarre family life and starts distancing herself from them. Her days are filled with forced blowjob sessions from her father, and she is not only repeatedly raped by her brother but also displays her own aggressive sexual side. The film also depicts scenes of her mother engaging in incestuous acts with her brother, portraying a household consumed by rampant familial promiscuity. Within this twisted environment, incest is treated as an ordinary, everyday occurrence.