Miwa Yamamoto, a married woman who had been temporarily staying at her sister's home, found herself inadvertently catching glimpses of her sister and brother-in-law's intimate moments. The reason was her own intense desire—her husband had fled, unable to keep up with her nightly demands. Though her brother-in-law kindly listened to her loneliness and offered comfort, Miwa's gaze had already turned hungrily toward his groin.