Hikari was not blessed with children, but she and her husband are living a happy life without entering the water. One day, her husband's younger brother, Kotaro, who had been living on his parents' shins, suddenly rolled in after his parents died. "People don't understand me" ... Kotaro, who couldn't hide his frustration that his brother, who didn't do anything and thought he was inferior to himself, was married and living in harmony with a beautiful wife, forcibly took Hikari as if to relieve his frustration.