Yuma was forced to leave home temporarily due to his wife's training. In her place, his wife's mother, Mio, would take care of him for two days. Though initially reluctant, he began to see Mio—always kind and gentle—as a mother figure, and inwardly, he was actually happy. Unexpectedly, the two of them spent their time together quite pleasantly. However, Mio's warm yet sensual demeanor, along with the seductive scent of her sweat-dampened body, gradually stirred Yuma's emotions. Unable to suppress his desire any longer, he gave in to his urges, and a new relationship began to unfold.