There are a few things that I have reminded me in some light or adjacent fashion about some elements of the stories you have talked about earlier
and the thing about them is that there are - indeed - aspects that show similarities to the elements of story in your past described scenarios.
But it's good to have these as references to figure out simple mechanics of the elements to use for story - whether they be objects, settings, or particular descriptions for the ideas to be explicit and fresh in minds.
The Scarlet King story and "The Inner World"
The "Inner World" is a placeholder name for some name that could either have a name or not have a name. It really depends on what import you may want to have to either having a name for the audience/player to have knowledge of or just say what the place is implicitly or indirectly (in-game text files or clues written on the walls [sometimes literally] in the world or through environmental story telling similar to *Fallout: New Vegas* or Hidetaka Miyazaki's Souls' IPs.)
The thing that we do know about the "Inner World" is that it, like the story element of the "world of the inner mind" concept found in the 2000 movie The Cell where instead of the serial killer's mind, we're going into that of a mere kid with a lot of Id force sensitivity.
Who and what is the kid?
There has to be a lot of fleshing out of this character because the fact of the matter is that we don't exactly know what's going on really between the kid and the other characters in question. A character map will be necessary to start and a list of all the characters.
The Character List
- Kaine (Normal & Fugitive)
- Sonos
- Kid
- Seth
- Sver
- Diedra [Inner World Form & Real World Homeless]
- Judeus
- Detective
- Orion
- Luna
- Id (Personafied)
- Shogo