Yiguan: December is a dark Chinese-style suspense romance game that combines management, character development, story exploration, AI-driven conversations, and dangerous visits.

By day, you manage a mysterious house, arrange monthly actions, and raise each heroine's attributes. Different choices may affect their mood, affection, trust, and the progress of their personal stories.

By night, you explore strange locations, search for hidden clues, and face the shadows behind the December cycle. Some clues may appear through investigation, some through story choices, and some through conversations with the heroines.

The game features AI conversation events. You can speak freely with each heroine, and their replies may contain emotional reactions, relationship changes, or hints connected to hidden clues. The AI system does not generate images, video, audio, or explicit adult content.

Survive until December, uncover the truth of the cycle, and bring her back.