One day, Yumi, a mother, casually checks a package addressed to her son. Inside is a full-body fishnet stocking... "I thought I'd use it with my girlfriend... so..." "I don't remember raising you to be such a pervert! I'm confiscating this!" She takes the stockings away from her son, but that night, out of curiosity, Yumi puts them on and trembles with excitement... "It feels strange... but somehow... my crotch... is tingling... this... is perverted..." And so, forgetting that she's in the changing room, she indulges in masturbation.