Yugi Mutou is the image of pure innocence. He loves to play any type of game and is quite a skilled gamer.
As lucky would have it, his grandfather owns a game shop where both he and Yugi live.
As a freshman at Domino High School, he get picked on by bullies very often because of his small child-like demeanor. But Yugi's best friend, Jounouchi is
always there to back him up. Yugi's friendship with Jounouchi is deep and strong, both are willing to sacrifice anything to help eachother.
Eight years ago, Yugi's grandfather gave him a long lost Egyptian artifact, known as The "Millenium Puzzle" among other things. The Millenium Puzzle has never solved in a millenia because it cannot be solved by just anyone. No matter how skilled they are. They must be chosen.
The puzzle was kept in a golden box with it's offer written upon it's walls:

"The one who completes me
will inherit powers and wisdom of Darkness"
But there is more to it's legend...
It is also said the one who completes the Millenium Puzzle will be granted one wish, may engage the Game of Darkness and will become the King of Games...