HBAD-689 [Uncensored Leaked] I'm f** to serve my frustrated, big-breasted, big-buttocked gal sister whenever she has free time. - Oto Alice

Ayumu, who enrolled in a prestigious high school in Tokyo, dislikes communal living in the school dormitory, so he's staying with his older sister, a "gyaru" (a type of fashionable, trendy girl) who lives in the city. However, his sister is a "gyaru" and a slut, constantly bringing different men into the room and having sex, which is distracting Ayumu, a teenager who is very curious about sex, and he's having trouble concentrating on his studies...