A few years after marrying her husband Toru, Yuko has still not been able to close the gap with her stepson Manabu. This year, she decides to return home to Toru's summer vacation in the hopes of finally getting closer to him. However, for Yuko, who is used to city life, living in a wooden house without air conditioning is unimaginably hot. <Sweat running down her neck> <Sweat floating on her chest> <Overflowing armpit sweat> The obscene sweat that covers her whole body drives Manabu crazy, and he begins to think of Yuko not as a mother but as a woman.