Ryoga challenged Yuma Tsukumo to a Duel. When the mysterious entity Astral appeared before them a new legend began.
In the school that Ryoga and Yuma Tsukumo attend, Ryoga is known to be a bully, taking the Decks of his opponents when he beats them. Ryoga defeated Tetsuo and took his Deck.
This caused Tetsuo's friend, Yuma to offer his pendant in exchange for the Deck back. Ryoga responded by breaking the pendant in half, so Yuma offered to Duel Ryoga himself, with his own Deck on the line