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Before their plans would ever come to fruition, the Gods threw the yokai a wildcard. Created from seedlings, they were precious creatures that the Gods looked after and tended to with care. The yokai became sick with jealousy and rage. Even the Gods most trusted yokai turned on them and tore into the garden of humans, causing carnage and loss. Instantly the yokai were expelled from the Garden and dragged the rest of the human saplings with them to earth, spreading the seeds throughout the world and unconsciously populating the planet.
As time went on and the world developed, yokai evolved as well. They created glamours in order to seamlessly blend into the human populace, deceiving many into believing that they were of the same species. The yokai created conglomerates and kingdoms, pulling the strings through veils and inside the safety of their own homes. They couldn't allow their glamours to be seen through, not if they wanted their aliases to remain safe.
Their methods, while proven to be effective, were... Unconventional to say the least. The Yokai worked for their own personal gain, tempting humans and whispering sweet nothings in their ear in order to steal their most precious belonging; their souls.
A dangerous dance with the balance of two worlds treading on thin ice, it begins with a wish. Of course, nothing is free. Should you choose to use the service's of the yokai, your soul will be bound to their service. A wish for a favor. After this, the entirety of your existence will be meaningless. In the end you are nothing more than a meal for a boss who can decide whether or not to feast on you based on if you are still useful.
Even among the lowest of mortals there is an ethical code. Once a soul has left the body, it cannot be brought back. No dead can return, no lives can be taken by the hands of a yokai. There are loopholes of course, such as a yokai can lend its power so that a human can take another life. It works as a contract, before the wish is seen through the terms must be met and signed by both parties. After the human's wish has been granted, they are forever indebted to the yokai and must carry out their will like the yokai once did for the Gods.