Looking at the commentary, it seems this strip was inspired by the Road of Liminality description in Perfect Memento in Strict Sense, where it mentions that there are festival stands with things like dead goldfish catching.

"Wait, so the Fish Catching Stand is a scam????"
"Well most of Festival Stands are already scam in themselves"

Also this is kind of like, Scam to another level. Goldfish Catching? Already Rigged. And Road of Liminality's Goldfish Catching? Even more Rigged.

Wait, if the fish from the Sanzu can't be caught because they're ghosts, then how can they be fished by Urumi?
Also is no one caring about Tojiko and how she's probably panicking about Futo?

Urumi is a very good fisher that can catch ghosts.

And Tojiko's fine, too, they're a ghost.

Unless... OH NO URUMI CAUGHT TOJIKO D:

So, if your net
Cannot catch goldfish,
Who're ya gonna call?
GHOSTBUSTERS!

Hmm. If they're dead, does that make them ghoulfish?