Planned Release Date: June 2026

About This Game

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.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

This game uses generative AI in a limited and controlled way.
During the monthly Heartbeat Event, players may enter a short message to a heroine. An online AI model may generate a brief character response based on the current story progress, character state, previous player choices, and unlocked clues. It may also return structured gameplay results such as mood, affection, trust, and monthly modifiers.

Some AI dialogue may provide hints related to main story clues, hidden information, or the route toward the perfect ending. The AI feature does not generate images, video, audio, explicit sexual content, or adult-only sexual content, and it does not create new endings or story routes outside the game’s designed narrative. AI output is controlled by server-side rules, content filtering, clue restrictions, and safe local fallback text.

Mature Content Description

The developers describe the content like this:

This game contains mild mature themes, including suggestive character outfits, romantic tension, occasional suggestive dialogue, dark horror atmosphere, unsettling scenes, monsters, and psychological horror elements.
The game does not contain explicit sexual content, visible genitalia, graphic nudity, or frequent gore. Violence and horror content are generally presented through atmosphere, story events, monster encounters, and non-explicit visual scenes.