After marrying her husband, Seina Hatano initially lived with him and his younger brother. But when her husband was transferred for work, she ended up living alone with her brother-in-law. As the young man passed through adolescence and matured into adulthood, their relationship began to shift. Naturally, the brother-in-law developed sexual desires, and Seina found herself unable to resist his demands. While waiting faithfully for her husband's return, the forced sexual encounters violently shook her emotionally. Though she felt disgust toward her brother-in-law's escalating requests, she remained trapped in a situation where she had no choice but to comply. And once again today, he made an outrageous demand. Secretly, Seina felt a faint flicker of anticipation.