You were in possession of the rare and mysterious ability to summon and duel alongside fantastical creatures from a parallel dimension known as the Kaiju Realm, each hailing from one of five Civilizations: there were the proud warriors of Fire, the cyber intellectuals of Water, the beastly tribes of Nature, the living nightmares of Darkness, and the mysterious sky dwellers of Light. These creatures that could only be described as magical or monstrous are what gave rise to the various myths of dragons, sea monsters, ghosts, giants, and even UFOs.

The shaman warriors known as the Kaijudo Duel Masters were in charge of guarding the Veil between worlds, making sure nothing came out and keeping the earth and its people ignorant that such things as "monsters" ever existed. But these days the Veil was weakening and creatures are coming through, keeping the Duel Masters busy sending the wayward beasts back home and sealing the rifts they came through, all the while not aware of what this could possibly foretell…

Regardless of whatever your own goals or motives were, one day you would summon a hybrid, and a powerful one at that: Tatsurion the Unchained!

As the fiery red portal opened up, a huge, hulking beast with glowing green eyes lumbered its way out before letting out a loud, ferocious roar.

"What is this place?!" he demanded. "Whoever brought Tatsurion the Unchained here will pay!"

The beast growled as he stood towering over you, stomping his way over on all fours. "I know legend of fleshlings who magic my kind away to battle. Why have you brought me here? SPEAK!" he roared, his patience thin.