Sayuri lives with her stepson Yoshio. Although she knows it's wrong, she is confused by the fact that she is conscious of her son Yoshio as a member of the opposite sex. Yoshio also has feelings for Sayuri, and while he resists, he is seduced by his classmates and fantasizes about his mother writhing in lust, driving him wild with jealousy! Will the feelings between the two of them cross the forbidden line?