Minori is a wife who lives with her husband and her husband's brother. Unlike her husband, her brother is earnest and kind. One day, her husband commits a hit-and-run on his motorcycle, and her brother makes him turn himself in. Her brother has always seen Minori as a woman. Minori notices her brother's gaze and they are drawn to each other, and they give in to each other's body. A forbidden life between Minori and her brother begins.