If you're using only AI Studio then you haven't scratched the surface.
Gemini 2.5 pro has the best tracking of details and ability to follow instructions strictly.
>going to try
I'm not talking about something that you can just do off-the-bat by hand - or rather, you would not have a good time doing it, because you would be practically writing the story yourself. The aim is to have a sort of automated system outside handling all that which is basically generating the context and most of the instructions that are going to be sent to the primary chapter generation model. A simple example is Sillytavern's Objective extension, where you give it an 'objective' for the story to move towards, and it will generate all the intermediary steps and insert them into the text sent, so the story will always feel 'railroaded' towards a specific goal until it is considered to be achieved, which can be reasonably validated by the LLM.
Another example of a project in development is this:
https://github.com/p-e-w/waidrin
Basically you don't rely on the LLM to track the story state at all, but track it outside instead using conventional methods.
So what could be in the prompt instead is something like, "If a new character was introduced in this response, append the pertinent details within the
And then you have a parser outside watching the response which then saves that into a database.
Then when the story needs to move to a scene that needs the character, the tool puts all the necessary character information like where they currently are, their current relationships, etc into the context instead of using just the past text generated.