Hikari was not blessed with children, but she was living a happy life without getting married. One day, her husband's younger brother, Kotaro, who was living off his parents, suddenly fell into poverty after his parents passed away. "No one understands me"... Unable to hide his resentment that his brother, whom I once thought was inferior to me, had married and lived in harmony with a beautiful wife, Kotaro forced Hikari to vent his anger.