At the top of Tokyo Midtown Tower—the headquarters of the “Society for Research on Acceleration”—sits Archangel Metatron, in a mysterious organization that sets up plots within the “brain burst.” To discuss the attack on the completely invulnerable Enemy of the Legendary Class that protects the Society, a Conference of the Seven Kings is convened. A secret plan is adopted there: to teach Silver Crow a new ability—the “Perfect Mirror.” After being tasked with studying a power capable of resisting Metatron’s overwhelming deadly laser, Haruyuki learns that, unlike “Incarnations” created from mental images, “abilities” only activate under specific conditions. So despite Haruyuki’s strong imagination, it isn’t enough to master the Perfect Mirror. When Haruyuki is finally completely desperate, Ardor Maiden—also known as Sinonìa Utai—tells him a sad story about her past…