HBAD-689 - I am made to serve a large-breasted, big-butt GAL older sister with unfulfilled desires, Eto Alice.

Ayumu, who entered a prestigious school in Tokyo, is not good at communal living in the school dormitory, so he is allowed to live with his GAL older sister's room in Tokyo. Because his GAL and sexually active older sister constantly brings various men into the room and has a lot of sex, Ayumu, a pubescent teenager who is interested in erotic things, gets distracted and cannot concentrate on his studies, so he is troubled...