Disclaimer: I own neither Fate/Stay-Night nor The Devil Is a Part-Timer!

Golden king was in trouble.

After being defeated by that Faker and being devoured by that damned grail hole he got thrown into another looks-like-worthless world. And the Grail had audacity to deprive him of access to his treasury. Even his body was no longer fit for a king. Preposterous.

He would show them who is the rightful king of this world. As soon as he gets his powers back. For now he would raise his army. It would be unsightly for a king to do everything by himself.

Mongrels! How dare they not recognize him for what he is. He had to give up his earrings to convince them to provide him with the documents that proof who he is. And so Gil Golden was born in this world.

With amount of money enough to sustain this fake body for less then a month. He needed source of income. Employment agency dared to tell him that there is no 'king' vacancy. He will show them their place later, when his powers are back. For now they suggested him to work in a fast food restaurant.

Month later.

-Two burgers and diet cola please.

-Yes, two mongrel burgers and faker cola.

Work was progressing smoothly. His coworker Mao Sadao had dared to claim that he's going dominate the world. Gilgamesh would have nothing of it. He will subvert the impudent plan of that mongrel by displacing him as employee of the month. And with that he will be one step further to being recognized as the king of kings.

-And a smile please.

-Yes, golden smile of the king.

But now there were customers to serve. Being a king has a tough job.

My first ff attempt. If someone finds idea good enough to write more, feel free to adopt it.