Aika returns to her parents' house where her brother-in-law lives alone to visit her father-in-law's grave. That night, her brother-in-law witnesses his younger brother and his wife having sex and feels angry at his brother for not satisfying Aika. The next day, while Aika is taking a nap, he approaches her and says that he can make her cum as many times as he wants. Aika resists, but as her insatiable brother-in-law makes her cum again and again...