Yugi Mutou was an ordinary schoolboy who could never quite stand up for himself and was always self-conscious. He was smart, but not extraordinary, and he could never take the challenges other villainous schoolboys threw at him.

Then, one day, everything changed for Yugi. He obsessed over a strange ancient Egyptian artifact that contained the pieces to a puzzle--until the puzzle was solved. The finished product was a bizarre, golden pyramid that granted him strange and dark abilities! Whenever he or his friends are threatened, he is instantly transformed into a more powerful, taller, and older version of himself! Not only does he gain the brilliance of a genius and enough self-confidence to fill a gymnasium, he also gains the ability to master an unusual set of cards and to draw villains into a dreamlike world where reality is at Yugi's whim...

In fact, he's literally the King of Game (Yugi=game) and anyone who challenges him must face the wrath of his many, monster-filled cards, strange games of chance and skill, or rolls of the dice!