Debt Sisters

Kasumi and Kaho Miyamori are two sisters drowning in yakuza debt left behind by their late father. Kasumi works as a teacher to keep things afloat while Kaho picks up restaurant shifts — but it's not enough, and the people they owe are not patient. When Hiroyuki, a student Kasumi tutors privately, finds out what they're dealing with, he offers to clear the debt entirely. The catch is exactly what you'd expect from a 2-episode hentai OVA: he wants both sisters as his sex slaves until he decides they've paid him back. That power imbalance is the whole engine of the story, and the series doesn't shy away from how dark that arrangement actually is. The animation from Blue Cat is detailed and deliberate, and the tone stays heavy throughout — this isn't lighthearted at all. If you've watched Immoral Sisters and appreciated that mix of coercive setup with genuine character detail, this hits a similar note. Fans of Musashino-sen no Shimai or Ane Jiru The Animation will also recognize the sibling dynamic and the slow-burn tension the premise creates. It's adapted from a visual novel, so there's a bit more character framing than you might expect from something this short — the sisters feel like actual people rather than just props for the scenario. Two episodes, straightforward premise, no ambiguity about what it is. Go in knowing the tone and you'll get exactly what the setup promises.