I've been dating my girlfriend for six months as lovers. Her mother, Rieko, is a single mother who raised her daughter alone—a kind, beautiful, hardworking, and composed adult woman. However, aside from my relationship with her daughter, I've also started a sexual relationship with Rieko. Despite both of us knowing this affair is wrong, an uncontrollable desire has taken root between us. Now, we're both struggling to figure out how to deal with these feelings.