The world revolves around humans controlling demons to perform superhuman tasks. Kiwi is one of those people who always dreamed to be a controller of the demons, one of the Possessed. However, upon discovering the truth behind how Possession works, Kiwi abandons his ambitions and is cast out from society.

One day, after receiving a beating from bullies that he will never forget, Kiwi discovers that he has a unique power of his own. Armed with this new power, Kiwi is employed by a mysterious man whose secrets know no bounds. Together, the two of them embark on a journey where they discover that the line between human and demon is not as clear as one might expect...