Mizuho Takeuchi is a kind woman who cannot say no to others, living a smooth and happy life with her husband. However, a problem lurks within her household—her brother-in-law Akira, whose intentions differ greatly from her husband's. Divorced and unemployed, Akira began staying at Mizuho's home at the urging of his mother. After several days, Akira grew reckless and suddenly demanded Mizuho show him her naked body. Reluctantly, she complied, unaware that this moment marked the beginning of Akira's calculated scheme. She hadn't realized it yet, but this single step would become the turning point that changed everything between her and her brother-in-law.