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

OVA · 2012 · 2 episodes · Rx - Hentai
Hentai
Ryouhei is suddenly summoned back to his hometown in the countryside. There, he meets Karen the mascot-girl of a lodging house. As he stands entranced by the sight of her bewitching proportions, Nagisa, the sister of Ryouhei's ex-girlfriend and the one who introduced him to Karen, looks on uneasily. (Source: AniDB)
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