"Hana", a high school student who came to Tokyo to take an exam in Tokyo.In the meantime, the reception destination is "Nakano family", which is a relative of "Hana". The Nakano family has a dull ronin son named Tadashi, but he doesn't study every day and just jerks off in front of the computer, leading a hopeless life.Such "Hana" and "Tadashi" were reunited for the first time in several years ... but before I saw them for a while, my cousin had evolved into a ridiculously huge breasts!In the past, they often took a bath together and slept together.