My mother, who recently got divorced because of my father's affair, has been depressed for a long time. When my two brothers saw my mother like that, they tried to cheer her up somehow, but it didn't work. One day, my older brother Atsushi witnessed my mother masturbating because she was lonely. Atsushi was excited by the sight of my mother playing with her pussy, and he hugged my mother, saying, "If you're so lonely, I'll do it for you!" And the two of them became in a forbidden relationship... But then my younger brother Kenji found out about my relationship with Atsushi...