Is Garden hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2013 · 2 episodes · Rx - Hentai
Hentai
Garden is a place (maybe another world) created for the sole purpose of accepting every sexual actions between its participants, allowing them to fulfill their deepest sexual desires and find eternal happiness, which you'd be unable to discover on earth.
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