Is Seikoujo: Haitoku no Biden Dorei hentai?
English title: Dark Chapel
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2006 · 2 episodes · Rx - Hentai
Hentai
Sister Rosaria is working at the village`s local church. Everything has been peaceful and many days of happiness have passed. One day a new priest and a sister arrive...and her happiness is suddenly shattered. The two are imposters, villains on the run for theft and murder. But that isn`t the only problem...the man is a former priest who sexually assaulted sister Rosaria many times in the past. Now, the village`s peace is in her hands; if she doesn`t obey "Father Edwards", he has sworn to kill every single one of the villagers... (Source: AniDB)
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