I laughed out loud
Can someone remind me again, do the Monster Town stories take place in the same universe as Sengoku Youko? I know they share a universe with Sanjin Sadou, since a couple of characters from that appear in one of the previous stories, but I can't remember if Sanjin Sadou takes place in the same universe as Sengoku Youko.
If it did, that would mean it also shared a universe with Spirit Circle and, by extension, Biscuit Hammer.
Unraveling the Mizukami-verse may take some work, but I've been an avid fan of Brandon Sanderson for years, so I'm used to using vague clues to tie multiple fantasy/sci-fi stories to the same universe.