Hikari was not blessed with children, but she is living a happy life without getting married. One day, her husband's younger brother, Kotaro, who was living off his parents' shins, suddenly fell into her life after his parents died. "Everyone doesn't understand me"...I can't hide my frustration when my older brother, who I thought was inferior to me, got married and lived harmoniously with a beautiful wife. Kotaro forced Hikari to vent his anger.