A Fat Cuckoo's Journey to Another World

It is round, one meter tall, blue-black, with its hat and body growing together. Don't remember who you are, where you come from, why you are here. He can only say "Cuckoo Gaga", and he has a natural little pocket on his belly that can always find strange things. What it doesn't know is that all the fictional animations, novels, and fairy tales created by humans have all turned into the real world and descended on the earth. And it is walking in the cracks between these worlds, swaying and knowing nothing, but it seems that all the worlds are waiting for it to pass by.