Our beautiful mother-in-law Miyo Hiyoshi

The movie revolves around the complex and intimate relationship between a son-in-law and his beautiful mother-in-law, Miyo Hiyoshi, while the father is away on a business trip. As they spend more time together under the same roof, they develop strong desires for each other, leading to a series of passionate and secretive encounters. The central dramatic tension arises from the need to keep their affair hidden from others, particularly the absent father, and navigating the moral implications of their actions.