Hana, a high school student who came to Tokyo to take an exam. The place where she was accepted during that time was the "Nakano family," Hana's relatives. The "Nakano family" has a son named "Masao," a dull ronin (a student who failed to enter university and is retaking the exam), who spends his days doing nothing but masturbating in front of his pc without even studying. It was when Hana and Masao had a reunion after several years that... somehow, her cousin had undergone an ultimate evolution into incredible huge breasts in the meantime! Taking advantage of the fact that they used to bathe together and sleep together often, Masao reaches for Hana's breasts.
