Is Ai wa Kagi no Kazu dake... Fuuzoku Mansion hentai?
English title: Love is the Number of Keys
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2002 · 1 episodes · Rx - Hentai
Hentai
Jun is on his own for the first time, as his father has gone overseas for a new job. He stays behind because of schooling and moves into an apartment complex as an assistant manager, only to discover that the place is a sex service apartment.
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