The first stage of the story is urban fantasy, where there is magic.I haven't play the game,the description says isekai but from the screenshot the environment seems modern so which, is it just for the prologue?
In my plan, the MC will later come to various planets of all kinds, some of which will be as close to medieval as most fantasy works.
There are also sci-fi elements, a planet with high technology.
I want to add all sorts of characters to my story, and a world like that would be ideal.