Working Slutty Older Sister: The more hardworking a woman is, the more sexual desire she has. Ran Kosaka

The movie explores the theme of a working older sister, Ran Kosaka, and her relationships, particularly with her husband. The title suggests that the more hardworking a woman is, the more sexual desire she has, which is reflected in the conversations and interactions between the characters. The central dramatic tension revolves around the exploration of desires, boundaries, and secrets within their relationship.