The protagonist is confined to a room by a captor. No matter what escape attempts he makes, they fail. Over time, the situation evolves from imprisonment to psychological and physical conditioning, typically involving repeated sexual encounters with the captor (often a female captor, depending on the route).
Japanese adult visual novel / eroge (by Appetite Publishing) Yatte mo Derarenai Heya ni Tojikomerareta no de...
Would you like a more detailed walkthrough, character breakdown, or content warnings for this specific title? The protagonist is confined to a room by a captor