A sultry and sleepy night ... A summer day when a frustrated body begins to ache and wants a penis and falls into a forbidden love. Kyou, who is married and lives in her husband's parents' house, was worried about her husband's affair. At that time, my brother-in-law, who left home 10 years ago and had no communication, lost his job and suddenly returned. I can't welcome my selfish brother-in-law and the atmosphere at home gets worse. Meanwhile, a desperate brother-in-law lost his reason and attacked the abundant breasts that could be seen through Kyou's sweaty clothes.