Maki is a hardworking woman who diligently manages her husband's career and household affairs after marriage. However, she struggles to accept her husband's sexual preferences, harboring quiet dissatisfaction deep inside. One day, she is asked to supervise the behavior of Satoshi, her husband's nephew, and their relationship quickly grows complicated. Though Satoshi appears infatuated with her, Maki repeatedly rejects his advances. Yet, she gradually finds her heart wavering under his persistent pursuit. Through Satoshi, she experiences pleasures she's never known with her husband—pleasures so intense they trigger a profound transformation within her. Torn by guilt over betraying her husband, she still finds herself unable to resist Satoshi's seduction. Maki's emotions begin to unravel as she stands on the brink of a new, forbidden romance.