Yuri's ordinary life takes a sudden turn when her brother-in-law, Ryuuzou, who had previously served time for attempted murder, shows up unannounced. With nowhere else to go after his release, he moves in with her and her husband until he can find an apartment. Having been forced into years of abstinence, Ryuuzou can't contain his pent-up lust upon seeing Yuri again and rapes her. From that day on, she is torn between guilt and pleasure, caught in a web of forbidden desire. A twisted relationship begins to form, altering the bond between her and her husband. As chaos disrupts their daily life, Yuri faces a storm of new emotions and inner conflict.