If its embedded in the game, that sounds like bepinex (Which is Unity only), or the tools for RPGMaker Engines, which is also another engine. This doesn't run on either engine and so neither tool would work for NewLife. No idea if there's similar tools for Java.
I had the same issue and found the RPG version (
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) to be easier for me. as i recall it writes shorter amounts at a time, so its easier to regenerate if you dont like the direction its going. you can write pointers in the bottom text box and press "regen last" to get the story back on track. it also writes summaries along the way to help the ai with longer stories, so it could be a good idea to check those summaries and eddit if nessesary.
if you really want to go all in, you could have a seperate text sheet with discription of locations and caracters and only copy the relevant information into the top text box. For example if you are at work, only have a discription of the work location and the caracters present.
