A very small boy wearing a raincoat and he has a tiny backpack on his back

A very small boy wearing a raincoat and he has a tiny backpack on his back. He's wearing a white raincoat with unicorn details, a pink shirt, beige pants, and doll shoes. He's holding a skull mask in his hands. His father is so small that the place he's in is completely bigger than him. And on top of the roof, you can see someone watching him with white eyes. This image has to be in anime.