Volume 20 in the popular Yu-Gi-Oh! manga series following the adventures of Yugi Mutou as he uses games designed by Pegasus, to fight various villains.

The quarterfinals are over, but not without casualties: Mai and Rishid lie in the infirmary, and if Marik isn't defeated in 24 hours, Mai will never wake up! As the airship speeds toward its mysterious destination, Bakura and Marik end their sinister alliance and fight a vicious duel over the Millennium Rod. But who is Bakura's unexpected ally?! Meanwhile, the four semi-finalists get ready for what could be the last duels of their lives. And for Jonouchi, it's his last chance to save Mai from Marik's deadly power...