The Demon Lord’s Project

Someone drags you out of your own bed while you're asleep and drops you in a castle you didn't ask to visit, and the being running the place won't explain why you're there or how long that's going to last. They're also known to kill people over a bad mood, so the smart move is staying agreeable.

The one perk of captivity is the company: the castle's other prisoners are all women, each with her own reasons for being there and her own way of passing the time with you. Wandering the halls, talking your way into their trust, and figuring out who's worth getting closer to is the whole point of the days you're stuck inside. One resident's story in particular keeps unfolding in stages, tucked behind quests you pick up in her office once you've earned the right conversations.