Shakkin Shimai
English name: Debt Sisters
Genres: Hentai
Type: OVA, Episodes: 2
Aired: Oct 25, 2007 to Mar 25, 2008
Studio: Blue Cat
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Kaho and Kasumi are sisters indebted to the yakuza.  A student learns of their predicament and decides to pay off their debt for a certain price; they must become his sex slaves until he sees that their debt is clear.