I was just thinking that it’s weird that Japan has Record of Lodoss war as its D&D equivalent and I’d love to see how they differ but I don’t think anyone has ever published the companions or rules in English and I’m curious why.

Probably because the market is saturated with world books. Everybody has a world book for something now and you can adapt anything with GURPS. If you're hardcore enough nerd you'll find the way to make niche materials. D&D and P2E have market share because they're the best known.

I suppose that’s true. I’m just surprised it didn’t make its way over during the anime boom when I would have guessed the us anime fanbase would have been very receptive