How do you run the demo, there is no way to launch the demo, or atleast, I can't find one
The "demo" is not actually a demo, it's just the translation pack to translate the game into Japanese. I do it this way because there's not a good way to distribute some files for free on a paid game, and I want the translation packs to be freely available for obvious reasons. Effectively the first game in the series serves as the "demo" for the series, and should give you a general taste of themes and what to expect.