Genmukan
English title: Genmukan: The Sin of Desire & Shame
Japanese title: 幻夢館
Alternative titles: Genmukan: Aiyoku to Ryoujoku no Intsumi
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Mar 21, 2003 to May 22, 2003
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: Studio Kyuuma
Producers: Green Bunny
Licensors: NuTech Digital
Genres: Hentai

Detective Satoru Kido is brought to a luxurious mansion to search for a lost jewel, but soon realizes there's more than meets the eye with the current lolita Mistress, the willing maid, the classic butler, the fugly manservant, and the sexy tutor. 

(Source: ANN)