As someone who's done a lot of research over the years on Japanese mythology, this game's take on those stories is very... twisted. It's waaaay off-message from a lot of things in the traditional versions of the tales it's working from, so when it tells you to look up the real myths if you're curious, I can strongly recommend doing so.
I'd actually be inclined to say it's more of a diversion from tradition than God of War was with Greek mythology, and that's a pretty high bar to leap over.
Game's awesome though, and the insanity of its storytelling is part of why. It's obvious from many of the references they make that they're probably quite familiar with what they're getting "wrong" about the stories they're using as a loose inspiration for their own. And it's even more obvious that the game is about having fun - and it does that really well!
Hey there! Thanks for your comment :)
Yeah we know we twisted a lot the Japanese mythology to create our own fun storytelling using it as a basis. We know this won't be liked by everyone but we hope they can enjoy the game nonetheless. It's more about the gameplay than the story.
We're glad you enjoy the game.