The "Three Swordsmen" who were called "Devils" and banished underground in the past finally awakened and resurrected after thousands of years! ! The Three Swordsmen used the magic of the human spiritual world (UNDERWORD) to revive the monsters that were defeated by the knights in the past one by one! ! Now is the time for the devil trio to start their revenge plan of conquering the earth! ! In order to stop this, WIZARD and FOURZE, Meteor, Nadeshiko, and Gathering, plus OOO, BIRTH, W, and ACCEL also appeared! ! Six knights VS the army of monsters, this unprecedented battle is about to explode!