I really hate how Mangadex keeps randomly switching title names for so many series. I saw "Kowaiya-san", and was like "what the hell is this? I don't remember this title.", and then I realized it was "The Creepy and Freaky", the name that was used ever since chapter 1 first got posted.
On the story though, man; this is getting wild. We already knew Sakagami became Cheshire, but seeing how and why? Crazy how a little story about a frog hearing scary stories ended up being a distant future where the world devolved into madness. Those scary stories are probably just NPC and Sakagami trying to restore Yonekura's memories, perhaps? I don't remember if people think Grenouille is Yonekura or not, but it kind of feels like that.