Hiiro no Koku
Japanese title: 緋色の刻
Alternative titles: Hi-iro no Koku, Secret of a Housewife, Time Colored Scarlet, Scarlet Moment, Hitozuma Inran Choukyou: Etsuko no Himitsu
Type: OVA
Source: Manga
Episodes: 5
Status: Finished Airing
Aired: Sep 18, 1999 to Sep 15, 2000
Duration: 27 min per ep
Rating: Rx - Hentai
Studios: Meltdown
Producers: Five Ways
Genres: Hentai

Based on the manga by Sanbun Kyouden.

A housewife gets raped by a bunch of men. As it turns out she likes it and her life becomes a succession of perverted sexual adventures. 

(Source: AniDB)

On May 28, 2008, Strawberry Jam re-released Hiiro no Koku under the name Hitozuma Inran Choukyou: Etsuko no Himitsu (人妻淫乱調教～エツコの秘密～). (Source: AniDB)