This is a really awful place for such an ornament. You now what every recovery room in every hospital need? You've guessed it! Nothing is as healing as a fucking jump scare above the patients on the ceiling!
"I've got those powers and I actually helped those people. I hated that! Because if I didn't have those the world would be suddenly a better place?" Wtf? If I would meet a person that would behave like him, I would judge that person as a mental. This MC has serious issues.
I'm also seriously sick of this forced "Japanese culture isn't that great, BUT IT IIIIIIISSSSSSSSSSSS AND IT'S SUPERIOR" trope. If I would read comics, in which german cooking, english tea culture, russian vodka, turkish bath houses or 50's american burger diners or something from where ever I'm living (or out of that places history) would save the world over and over again, I would lose my mind! When ever I started a new world in minecraft, the last thing I wanted to craft was soy sauce or currywurst mit pommes! The thing is to survive, but for those MC "Bring japanese culture to this world of barbarians" seem to be in there Top2!...That said, the onsen thing in this chapter isn't that bad. It is just a public bath house and that was a thing in many cultures and it still would be, if it weren't for the modern infrastructure. All hail pipes! Just replace the dreaded "onsen" with "public bath house" in your minds and everything is fine.