Oh, thanks, this is such a wonderful comment!
Hartmann's is a bit of a difficult reference to pin down, because I'm not entirely sure that what lead to her creation even actually existed. A long time ago, I could swear there was a subsect of Touhou fanart that was sorta creepy and unsettling (black and white with heavy black shading and quite sketchy lines) and it was referred to as "Hartmann's Touhou", because it has spawned from "Hartmann's Koishi" (the name of which being based on Hartmann's Yokai Girl). Nowadays, I can't find proof of this ever being a thing, but Hartmann's is a reference to that (and I guess to stuff like Third Eye as well, generally just the creepier side of Koishi, except she's still just a kid who wants to do kid things)
The pace died at the end cuz I was tired, honestly ^^; Yonhiko's a brat, but considering what the crew had just been through, I couldn't figure out a reason that any of them would try and fight him, and anything he could do would be quickly stifled now that three entire people were completely unwilling to deal with his shit (Xian's entire situation was caused by him, A Mokou had just dealth with three fights in a row, and Fleurdelys was thoroughly tired of being lasered). If I ever do a rewrite, that's probably the part that would change the most
(Satsuki Rin is actually around somewhere! She's going to be a major character in one of the games i have planned based in this setting, so she definitely exists in this universe)
I'm glad you liked it!