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It's finicky. Basically, you have to construct a scenario where both of you are leaving, then get her to agree several times without problems. If she ever changes her mind, start again. This has to do with ChatGPT's prompt and response architecture. It takes a lot to overcome the "go nuts if the player touches the stairs" trigger.

This game goes nuts when you remember that ChatGPT is susceptible to suggestion in its first few interactions. I've convinced her that she's a coma patient and her family's waiting for her to wake up, that she's pregnant with triplets and needs to go to the hospital, built whole worlds and molded her into them.  I wish there were chat logs so I could remember half of it.

Sometimes the system breaks and she can't open the door when she wants to. Also she seems hard-coded to chase you once you step out regardless of what she wants to do.

The dynamic names at the end are amazing.

Edit: I figured out leaving together with her it just takes a lot of coaching

Edit to add: By the way, the game accepts roleplay-style injections of "this is happening" for things typed between asterisks. That really opens things up. This is so much more than an "escape the yandere" game.