After marrying her husband, who had come from the countryside to work, and living happily in the city for several years, Keiko, the wife, was worried about her stepson Kyō, whom her husband had left behind in his hometown... One day during an unprecedented heatwave in the middle of summer, Keiko decided to return to their hometown with her husband. However, for Keiko, who was used to city life, living in a wooden single-family home without air conditioning was unbearably hot. Sweat trickling down her neck... sweat welling up on her chest... the obscene sweat covering her entire body pushed the stepmother and son into a twisted relationship...
