The first Immoral Sisters DVD was produced in Japan in 2000. Immoral Sisters was then released in the United States by NuTech. The original DVD has a running time of 90 minutes, which includes three different episodes: Nights 1, 2, and 3. Immoral Sisters is a hentai video. In Japanese, the word hentai is slang for 'perversion.'More specifically, hentai is animated porn. Animation and comics are hugely popular in Japan. The vast majority of manga (Japanese comics) and anime (Japanese animation) are non-pornographic, but hentai anime and hentai manga are very pornographic indeed. In fact, hentai often revolves around extremely graphic, hardcore sexual situations that one rarely finds in live-action porn. Immoral Sisters is the story of Yukie, an attractive housewife who gets into a car accident. Because she can't afford to pay the settlement to Taketo, the other party in the accident, she offers to have sex with him. This leads to a lengthy and rather complicated sexual blackmail. Eventually, Yukie's two young daughters get in on the act, trysting with Taketo's powerful father, the president of Nogawa Industries.Immoral Sisters was popular enough to lead to the creation of Immoral Sisters 2, released by Kitty Media in 2005. The second Immoral Series begins with the return of Yukie's brusque husband. The plot involves incest between the recently returned father and the titular immoral sisters, but the taboo is somewhat mitigated because the girls, we discover, are adopted.