No yandere is sane. Any yandere character you ever saw in anime would be put in a mental facility for their behavior or jail. Yandere is by definition "crazy". This character is not Yangire. You don't know the difference. Yangire is the type to stab you just because she wants to, she doesn't need a reason.
Now if you want to say she gets angry when your response was completely innocent and not possible to misunderstand, then thats just a flaw in AI and has nothing to do with her personality. In which case there isn't much that can be done aside from tinkering with the AI prompt.
Dev would you consider support for locally hosted AI models through something like kobold? I would love to play this game but I simply do not have the money to spend on a subscription service for just this game. And even decent low end computers should be able to run a model (7b) that would be just fine for this game.
Make sure you allow your phone to install APKs from unknown sources in your phones settings. (I recommend turning it back off after you are done for safety precaution)
Have you completed her challenge? You need to get her to fully open up to you and help her out with her problem. After that try talking to her about your relationship with her.
Stance is only triggered by certain monsters' special attacks. One instance of this is the oni sisters, the one that mainly uses hypnosis. If you meant the player facesitting on the girls then it currently doesn't exist.
