Reginald Kastle

Ryoga, a mysterious duelist who challenge Yuma Tsukumo, the number one bad boy at his school, to duel. When the mysterious entity Astral appears before them a new legend begins.

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After their battle, the two teamed up to fight againts other duelist who saw the Astral too. The other duelist who saw it became a follower of Kuzuki Igayama, a dark duelist who is planning to revive the 3 legendary demons who has the power to destroy the world.

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After the mysterious Astral, Yuma and Ryoga found out that they both have one new card each in their pockets. At the back of those cards have mysterious symbols. And that is the start of the jouney of Yuma Tsukumo, the next King of Duelist, with Ryoga.