Yui and Kirie have been secretly carrying on a lesbian affair. However, one day, Kirie tells Yui she wants to end the relationship. Feeling betrayed, Yui demands anal sex as a final act. Despite Kirie's resistance, she succumbs to the pleasure as Yui penetrates her ass. Kirie is then kidnapped and imprisoned in Yui's home, transforming into an inescapable anal lesbian sex slave.