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

A very small boy wearing a raincoat and he has a backpack on his back. He is wearing a white raincoat with unicorn details. He is wearing a pink shirt and beige pants. He has doll shoes. He is holding a skull mask in his hands. He is so small that the place he is in is totally bigger than him. The whole room is gigantic. It looks like it is abandoned. There is a huge table and he is on the dirty wooden floor. It looks like he is hiding from something. And on the top of the roof you can see someone watching him with white eyes. This image has to be in anime.