A two-part prologue special to the movie Yu☆Gi☆Oh!: The Dark Side of Dimensions set between the end of the Yu☆Gi☆Oh! manga and the beginning of the movie.

10th grader Yugi spent most of his time alone playing games--until he solved the Millennium Puzzle, a mysterious Egyptian artifact! Possessed by the puzzle, Yugi becomes Yu-Gi-Oh, the King of Games, and challenges evil-doers to the Shadow Games--weird games with high stakes and high risks! These graphic novels contain new stories not seen in the anime, including the origin of Yugi and his friends!
 
(Source: Viz Media)
 
Notes: 
- The Viz Media release split the series into three parts with separate chapter/volume counts. "Yu-Gi-Oh!" includes volumes 1-7, "Yu-Gi-Oh!: Duelist" includes volumes 8-31, and "Yu-Gi-Oh!: Millennium World" includes volumes 32-38. 
- The final chapter of Viz Media's "Yu-Gi-Oh!" was moved from its final volume to the first volume of "Yu-Gi-Oh!: Duelist."

Set six months after the events of the original Yu-Gi-Oh! manga, Yugi Muto and his friends are in their final year of high school and are talking about what they will do in the future. Meanwhile, Seto Kaiba has commissioned an excavation to retrieve the disassembled Millennium Puzzle from the ruins of the Millennium chamber. The item had previously housed the soul of his rival, Atem, whom he hopes to revive in order to settle their score. The excavation is interrupted by a mysterious man, who faces Kaiba in a game of Duel Monsters and steals two pieces of the recovered Puzzle. What is his ulterior motive? The stakes have never been higher; the rivalries never as fierce; the risks never so great. 
 
(Source: Wikipedia)

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