Kiriya Hakushaku Ke no Roku Shimai

Daisuke, a reporter, gets invited to stay in a secluded Western-style mansion on a hill, and the mistress of the house drops this on him immediately: you've been chosen to father children with one of my five daughters and inherit everything we own. Daisuke, reasonably confused, decides to stick around anyway. That's the setup for this 2-episode OVA from 2011, and it leans into both the erotic premise and a genuine undercurrent of mystery surrounding the Kiriya family and their isolated estate. The five sisters — Ai, Botan, Fujino, Kurenai, and Nadeshiko — each have their own personality, and the mansion itself has an eerie, gothic quality that keeps things from feeling like a purely straightforward adult title. There are hints of something darker lurking beneath the surface, a family secret that may not bode well for Daisuke at all. If you've watched Immoral Sisters and want something with a similar setup but a slightly more atmospheric, suspenseful tone, this scratches that itch. It also carries a vibe reminiscent of Yosuga no Sora in how it handles multiple sister dynamics within a single intimate setting. Being adapted from a visual novel, it retains that branching-relationship structure where each character feels like a distinct route rather than just background decoration. It's a short watch, two episodes, so it does not overstay its welcome.