Three stories of Uchiyama Mai's huge breasts. 1. Mai forgets to put on her bra while being taught by her uncle. Her uncle is turned on by his niece's large breasts! He notices this. 2. When she consults a gynecologist about her problems with frigidity, she is stripped of her clothes and given an erotic treatment! Who would have thought that intercrural sex would be effective against frigidity? 3. A customer is so excited by Mai's huge breasts and massage that he starts to play with his penis.