Illya, Miyu, Kuro, Luvia, Rin, and Bazett all head to the mirror world underground in order to face the Heroic Spirit of the eigth card. Centered in the ley line and stocking up a vast amount of mana, the only strategy they have is to through all of their might against him and take him down with their first blow. They unleash all the firepower they possess against that Heroic Spirit, but--?!