Mei-chan is a serious and kind girl. Her recent trouble is the big boobs inherited from her mother. Mei-chan, who has severe stiff shoulders because of her F-cup big breasts, is given a massage by her disgusting sister-in-law. A big brother who can't stand the breasts of her well-developed younger sister. Her hand becomes more and more erotic, fir her big boobs. "Brother? Is this also a massage?"
