Shiho lives with her husband and father-in-law. Her attempts to conceive with her husband are unsuccessful, causing increasing tension between them. As stress builds, Shiho begins wearing flashy clothes to lift her mood, and starts performing her caregiving duties for her father-in-law while exuding a seductive charm. Though surprised by her transformation, her father-in-law finds himself instinctively aroused. Responding to his reactions, Shiho's own desires intensify, leading her to seek pregnancy with her father-in-law.