Okay, I know the right-side panel is a reference to something, but I can't quite place it. Anyone?

http://dynasty-scans.com/chapters/memories#21

Okay, I know the right-side panel is a reference to something, but I can't quite place it. Anyone?

http://dynasty-scans.com/chapters/memories#21

https://en.wikipedia.org/wiki/GeGeGe_no_Kitaro

Ah, that's the one. I knew I'd seen the characters somewhere before.