A child from another world is dreaming about our world and is forced to have memories that are not his own. I wonder how long he can remain himself?
The story takes place in a world where monsters have almost wiped out human beings, and humans are surviving on the last five remaining cities. In this way, hundreds of years have passed since the human-monster truce, and a human escort agency received a business of unknown origin: transporting a cart of stones. A child secretly hid one of the stones, and since then he has been having strange dreams. The people in the dream all live in towers leading to the clouds. In that world, there was not a single monster...