Though humans do not believe it, there are supernatural races that live among them. They usually stay with their own race, but they do venture out into the mortal world. 

Satan has lived for a long time, and whenever he's bored, there is sure to be chaos. That's why he developed his own source of entertainment; the Game of Eclipse.

The game happens around once every a hundred years, and it shakes up the whole world when it does. Each supernatural clan is expected to select one individual among them and nominate them for the game. If they don't, their race will be wiped out by  Satan.

The participants are put into a different dimension created by Satan himself. What happens in this world is completely up to Satan, for he controls every and anything. The chosen ones must survive the trials he throws at them, and he won't go easy.

Another obstacle for the supernatural participants to finish the game is their human partner.

There are certain mortals that Satan chooses to put in his game, and they're chosen because of their dark pasts. Once in the game, they are paired up with a mythical being, and the two are to get through the game together. If the human dies, his or her partner will then disappear and vanish from the world.

They all know that they must team up in order to survive the game, but the problem is when they'll finally put away their differences and accept each other. All of them come from different pasts, some of them best left untold, and it's hard to just put that aside so suddenly.
   
Also, although mythical races are forbidden to have relationships with humans, that's not in the rule book of Satan's game. Actually, he finds it more interesting to have them fall for each other... then tear them apart.

 

What trials will Satan give this Game's participants?
What will happen during the game?
Survival or death.
It's all up to fate.

But who knows.

 

Maybe they'll be able to rewrite it.