It has been three years since she married her husband Osamu, who works at a securities company in Tokyo. Suddenly, Osamu announced that he wanted to become a day trader, and his wife Mako quickly changed jobs and moved to his hometown, because it was quieter in the countryside and it was easier to gather information. There, she met her brother-in-law Kyosuke for the first time. Kyosuke had a rugged, muscular body that was unimaginable for Osamu. Mako could not get Kyosuke out of her head. Meanwhile, Kyosuke was also Kokoro by Mako's large breasts, which were out of place in a rural setting...