Kurohime: Shikkoku no Yakata
English title: Black Widow
Japanese title: 黒姫 -桎梏の館-
Type: OVA
Episodes: 2
Source: Visual novel
Genres: Hentai
Studios: Mook Animation
Producers: Discovery
Duration: 28 min per ep
Rating: Rx - Hentai

A camping trip takes a turn for the wild when the group discovers a mystery mansion in the woods. Excitement turns to thrills of terror as people begin to disappear. Too late, they realize they are trapped in the clutches of a mysterious woman. Who is that woman and will the group of campers be able to escape the remote mansion?

(Source: AniDB)