Makoto Narimiya is a busty high school girl who works part-time as a home helper to earn money for school while attending school. She is sent to a house where there are only men and they are perverts who love breasts... The grandfather and the other five family members make her do perverted things like asking her to change his diaper or put a thermometer in their anus, and they are delighted! Mikoto uses her busty breasts to give titjobs and sex to help her with her troubled family, and she does her best as a helper. What will be the fate of Mikoto and her soft I-cup breasts?!