"No way, I, an ordinary housewife, would get into such a relationship with my younger brother at this age..." Aya Kurahashi (Kaname), a sister in her late 30s with two children, takes on the task of helping with household chores for her younger brother Takumi, a bachelor in his 30s, to supplement the family budget. However, Takumi, who had developed a fetish for mature women without Aya's knowledge, harbored secret desires for her... Driven by alcohol, Takumi casually established a relationship with Aya, and continued to pursue her, proposing a pragmatic arrangement. While claiming it was for the family's finances, Aya's body was overwhelmed by the guilty pleasure of her first experience of an affair...
