The Demon Lord's Project

You are kidnapped by a powerful Demon Lord and brought to their castle, where you're held captive alongside other prisoners—all attractive women with distinct personalities, histories, and desires. The Demon Lord is volatile and dangerous, killing people on a whim, so survival depends on staying on their good side. The game is a 3D sandbox where you explore the castle, interact with various female characters (including monster girls), develop relationships through quests and dialogue, and participate in intimate scenes. Progress through character-specific storylines, undertake missions, and gradually unlock new areas and romantic encounters.