MySYN

Stay awhile.

MySYN is an early AI companion sandbox about sharing a small space with Lilith. Talk about your day, tell her something worth remembering, or ask her to come closer.

Her mood, needs and your relationship influence how she responds: sometimes she agrees, sometimes she needs a moment, and sometimes she says no.

A quiet room. An ongoing conversation. A place to return to.

This is an early preview. Feedback on startup, controls and AI responses is welcome, especially from Windows and Intel Mac users. Mobile support is a future goal.

The current demo contains no explicit content, but will have this optional feature in future

In the current demo

• Natural conversation
  Type freely instead of choosing from a fixed list of replies.
• Memory across visits
  Lilith can remember personal details, preferences and corrections. Your conversation and relationship are saved locally.
• A shared room
  Ask her to approach, sit, stand up, rest on the bed or move to the window.
• A character with her own responses
  Mood and willingness affect requests and conversation. Getting an answer does not always mean getting a “yes”.
• Local AI included
  The models come with the game and run on your computer. No separate Ollama installation, AI account or API subscription is required.

Getting to know Lilith

Lilith's responses are shaped by her current mood, needs, memories and the relationship you build through your conversations. These influence both what she says and her willingness to act on your requests.

Ask her to come closer, sit down or move around the room. Depending on her current state, she may agree, hesitate or decline. The aim is to make spending time together feel like an ongoing interaction with a character who has her own personality.

Across visits, Lilith can remember details you share, such as your name, preferences and personal information. Corrections can help update what she remembers. Her memory is still experimental: it is selective, and misunderstandings are possible.

Conversations run locally using the AI models included with the game. Your saved conversations, memories and relationship progress stay on your computer.

Download the 0.1 preview

The demo is free. Donations are entirely optional and help support development.

Download MySYN — Windows and macOS

Windows x64

• Windows 10 22H2 or Windows 11, 64-bit.
• File: MySYN-Windows-0.1.0.zip — approximately 5.92 GB.
• A portable build: no installer is required.

Windows testing is still limited. The current build and archive have passed build and file-integrity checks, but gameplay on a native Windows PC has not yet been validated. Compatibility-layer testing of earlier builds is not a guarantee that this release will work on every Windows system.

macOS

• macOS 14 or newer.
• The macOS preview has been playtested on Apple Silicon.
• The universal package also includes Intel code, but Intel hardware has not yet been tested.
• Download size: approximately 4.6 GB.

This is a test archive without Apple Developer ID signing or notarization. For a download you trust, follow Apple's per-app opening instructions .

Memory, storage and response speed

• Allow around 15 GB free for downloading and unpacking.
• 16 GB RAM is a provisional testing target, not a confirmed minimum. Lower-memory configurations, including 8 GB systems, should work but have not been validated.
• The first session can take longer while the models load. Response speed depends on your CPU, GPU and available memory. CPU-only replies can take substantially longer.

This is an early preview. Feedback on startup, controls and AI responses is welcome, especially from Windows and Intel Mac users. Mobile support is a future goal.

How to play

Choose “Meet Lilith” or “Continue your visit”.

You could start with:

• “How was your day?”
• “Remember: my name is Alex.”
• “I prefer green tea without sugar.”
• “Come closer, please.”

Controls:

• Enter — send your message.
• Shift+Enter — insert a new line.
• Esc — open the menu.
• Hide chat / Show chat — change chat visibility.
• Cancel — stop a reply while it is being generated.

Your visit is saved locally, so you can return and continue later.

What comes next

This first demo is the starting point. My plans include:

• A new character model for Lilith.
• Improved animations and more expressive behaviour.
• More activities and interactions around the room.
• Direct interactions beyond typing in chat.
• The option to choose the AI models you want to use.
• A mobile version, subject to hardware and performance testing.
• Personality customization. Options to adjust Lilith's personality traits and conversational style, giving you more choice in the kind of companion experience you want to create.

These are development goals, not features already included in the demo or promises of release dates.

Before you play

18+ project. The current demo contains no explicit scenes.

Dialogue is generated by AI and can be unpredictable. Safe Mode is currently a settings placeholder and does not filter content.

This is an early prototype. Replies may be slow, memory can miss details, and animations and interactions are still being developed.

Lilith's memory is selective rather than a perfect record of every conversation. She can misunderstand something or remember it incorrectly.

Saves are stored as readable local files. Please review logs and saves before sharing them with anyone.

Feedback

What felt natural?
What broke the moment?
What would you like to do with Lilith beyond chatting?

Leave a comment with your thoughts and ideas. Feedback on conversation, memory, controls and room interactions is especially welcome.

For technical issues, please include your game version, OS, hardware and the steps that caused the problem.

Support development

The demo is free. If you would like to support MySYN and follow its development, visit MySYN on Patreon. Support is entirely optional.

Inspiration & special thanks

I want to give special recognition to Virtual Succubus and its creators.

Virtual Succubus was an important inspiration behind MySYN. The ideas and creativity in that project helped motivate me to start building my own virtual companion experience.

I have a great deal of respect for the work that went into it. It deserves more than a passing mention here: it is part of what inspired MySYN to exist, and I want to acknowledge that influence openly.

MySYN is an independent project and is not affiliated with or endorsed by the creators of Virtual Succubus.

Credits

The current character appearance is temporary. A new model for Lilith is planned.

“Mika Melatika from nijisanji (alt outfit)” by Kiddo Acosta is licensed under Creative Commons Attribution 4.0 .

Changes: scale, skin weights, Humanoid rig and Unity materials.

This is a third-party fan model. MySYN is not affiliated with Kiddo Acosta, Nijisanji or ANYCOLOR.

Furniture by Quaternius (CC0).

Additional licenses and notices are included with the download.