Screenshots
Watch trailer on Steam ↗异馆十二月
Qiyue Studio · Published by Qiyue Studio
Content notice: 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.
Positive — 100% positive (10 reviews)
Last updated 28 Sept 2026
Manage a mysterious house by day and explore a cursed town by night. Build bonds with three heroines, uncover clues through AI-driven conversations, survive deadly visits and battles, and seek the truth behind the December cycle before it claims everyone again.
Adventure, RPG, Simulation, Strategy · More free games
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.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10
- Processor: Intel Core i3 or equivalent
- Memory: 8 GB RAM
- Graphics: Integrated graphics
- Storage: 5 GB available space
- Sound Card: Any
Recommended
- Requires a 64-bit processor and operating system
- OS: Windows 10 / Windows 11
- Processor: Intel Core i5 or equivalent
- Memory: 8 GB RAM
- Graphics: Dedicated or modern integrated graphics
- Network: Broadband Internet connection
- Storage: 5 GB available space
- Sound Card: Any
- Additional Notes: Internet connection required for AI interaction features.
Supported Languages
Latest news
AnnouncementsOfficial
《异馆十二月》 Is Coming Soon | Final Development Stage
✨ 《异馆十二月》 Is Coming Soon!Hello everyone,We’re excited to share that 《异馆十二月》 has now entered the final stage before launch.The main game content is complete, and we are currently focusing on final testing, performance optimization, bug fixing, and overall polish to make sure the release version feels stable and complete.📌 Current Progress:- Core gameplay content is complete- Final testing and bug fixing are in progress- Performance optimization and detail polishing are underway- Store release preparations are being finalized📅 Planned Launch Window: July 2026The exact release date will be announced as soon as it is confirmed.Thank you so much to everyone who has followed and supported the game so far. Your support means a lot to us and helps the game reach more players.If you’re interested in 《异馆十二月》, please consider adding it to your wishlist so you can receive a notification when the game launches.See you in July!Read full article on Community Announcements (15371933011)Patch NotesOfficial
Dev Update: Combat Details and Chibi Battle Style
Hello everyone,Recently, the main development focus of December Mansion has been the combat system.In this round of development, we have continued refining various combat details, including character animations, battle pacing, skill feedback, and the overall visual presentation. After internal discussion, we have also decided that battle characters will mainly be presented in a chibi style.Compared with a more realistic or standard character-display approach, chibi characters are better suited to the current turn-based combat system. They also make character actions, skill effects, and battlefield positioning clearer and easier to read. Going forward, we will continue improving character animations, attack effects, defense actions, and ultimate skill presentations based on this direction.At the same time, we are also working on adjustments to equipment and treasure values. Our goal is to make equipment and treasures feel more meaningful than simple stat increases. We want them to have a real impact on character growth, combat choices, and the overall progression experience. Because of this, this part will require more testing and tuning.Please note that the current materials are still under development and do not represent the final version. The combat interface, character animations, equipment values, treasure values, and related visual effects will continue to be improved.This round of work involves a large amount of adjustment, but it is also an important step toward shaping the core gameplay. Thank you for your patience and support. We will continue sharing more development updates in the future. Please stay tuned.Read full article on Community Announcements (15371933011)Patch NotesOfficial
New Character Unlocked: Katarina
We are excited to announce that a new character, Katarina, will be added to Qiyue House!Katarina is a foreign widow with a passionate yet cold-blooded personality. She wields a sniper rifle and excels in charged attacks, making her a high-risk, high-reward damage dealer. In battle, she lurks in the shadows, waiting for the perfect moment to strike, leaving her enemies defenseless.Unlock method: Players can recruit her into Qiyue House after fulfilling specific conditions.The game is still under development, including UI, combat system, and story, but you can already add Qiyue House to your wishlist and follow for updates on new characters and content!As development progresses, we will continue to share character introductions, combat gameplay, and story highlights—stay tuned!Read full article on Community Announcements (15371933011)
