~Miboujin~ Niku Dorei

Six years ago, Yuki Takazawa moved to Moriwaki, home of the textile industry. Through an introduction from her relative, Yuki began working at a pub in front of the station. With her physical beauty and attractiveness, she quickly becomes popular and later marries Koichi Takazawa, an honest textile technician. They begin a happy life together, but Koichi dies of cancer four years later.
A week after Koichi's funeral, Yuki entertains her late husband's bosses, Saiga, Tsurushima, and Komaki. The three men suddenly pull out knives and threaten her. They tell her that Koichi embezzled the company's money and passed it to his mistress, Naomi Machida. The three beasts rape Yuki all night and force her to become Saiga's sex slave.
Saiga continues to sexually train Yuki. One day, Saiga calls Yuki to a club called Papillon, and he has her meet a dirty broker, Banji Sakamura, and the hostess of Papillon. The excitement continues to escalate... What will become of Yuki? What does Saiga really want from Yuki?

[From Gamelex]