The holy sword "Excalibur". Aiming at the rule of Britain, the sword of choice was prepared to determine the king. The person who pulled out this sword will be called "Arthur" and gain great power. However, more than one person pulled out Excalibur. As a large amount of power was generated, legends spread and caused a distortion of history. In order to put history on the right track, six Arthurs, called the Captain, Iron Fist, Mountain Cat, Your Excellency, Alchemist, and Wanderer, descended on the land of the past "Britain". Their mission is to break all Excalibur that distorted history. There are about 1 million of them. This is a rebellion against the past. And a battle to protect the future and the present.