Two thousand years ago, as darkness threatened to swallow the land, Japan's greatest sumo-priest warriors rose to face the monstrous Yokaimon. They were the original Sumomon™, and they won.

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Now the ancient enemy is clawing its way back to reclaim the world it once ruled.

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But a new generation is rising. Six unsuspecting teens, chosen by destiny and transformed into colossal guardians, are reborn as the new Sumomon™!