Requiem
English title: Anal Sanctuary
Japanese title: REQUIEM [レクイエム]
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Jun 25, 2005 to Jul 25, 2005
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: Eshoya Honpo
Producers: Milky Animation Label, MS Pictures
Licensors: Media Blasters, Kitty Media
Genres: Hentai

Based on a game by CLOCKUP 

Cannone is a violin that entrances people. Ceillia is a violin that was created by the angels that seals Cannone. 

Akio became a teacher for St. Cecillia Academy. He found Cannone sealed in the torture room under the chapel, he was fascinated by it's power. The other violin picked a girl to use it`s powers to steal Cannone. 

(Source: AnimeNfo)