Miki desires everything that belongs to her sister—her belongings, her boyfriend, anything and everything. Her obsession drives her to claim them as her own. One day, shortly before her sister returns home, the sister's boyfriend comes over. Seizing the opportunity, Miki starts seducing him. While her sister sleeps nearby, Miki cuckolds her—receiving facials, blowjobs, and riding him in cowgirl position. They move to another location and passionately engage in creampie sex. A dense, erotic story entwined with Miki's overwhelming desire.