Enzai
Genres: Boys Love, Drama, Horror, Hentai
Type: OVA, Episodes: 2
Aired: Apr 23, 2004 to Oct 22, 2004
Studio: Anime Antenna Iinkai
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
The protagonist is Guys, a young boy from a poor family, who gets caught for stealing candy from a Paris store. 

However, after being railroaded by a city detective named Guildias, Guys finds himself accused, convicted, and sentenced to life imprisonment for the murder of a man he never met.

From that point on, most Enzai takes place inside a dark, claustrophobic, dirty prison, in there, Guys experiences humiliation and torture of various kinds, much of it involving sexual acts such as rape and forcible sodomy.