Yoshie was left with her two sons after the death of her second husband, and as the years passed, she bore the loneliness of an aging mother. However, her son Ryo remained cold and indifferent toward her, while her other son, Atsutoshi, gradually grew angry at his brother's attitude. One day, Atsutoshi witnesses a secret act between his mother and Ryo in the bathroom. This shocking scene creates a new rift within the family. What kind of ending awaits their future?