My sister-in-law seduces me at my wife's parents' house Rin Azuma

The movie revolves around the narrator's visit to his wife's parents' house, where he encounters his sister-in-law, Rin. As they spend more time together, the narrator finds himself drawn to Rin, despite being married. The story explores the complex emotions and relationships within the family, particularly the bond between the narrator and Rin, and the moral implications of their actions.