Festival of Duality

The Ritual of the Sun and Moon (陰陽祭 Onmyō-sai) is a religious Ritual Duel which was conduced in ancient times.

Story
The Ritual Duel is conduced between a Duel Priest and a Duel Priestess inside the Sky Fortress Seibal, and it involves the ressurection of the Ultimate God.

Flow
The Ritual is begun with the Turbo Duel against a Duel Priest and Priestess towards Seibal. Then, inside the Fortress, two more Duels occur between Duel Priests: one in the Northern-Sky Corridor and one in the Southern-Sky Corridor. The winners of each Duel becomes the Supreme King of the Earthbound Lock and the Supreme King of the Heavenly Lock.

The rest of the Ritual was not yet revealed in the plot.