Accel World, Vol. 11 (light novel): The Carbide Wolf

The Acceleration Research Society, a mysteriousorganization maneuvering in secret, makes their headquarters at the top of TokyoMidtown Tower, where the Archangel Metatron is enshrined. This completelyinvincible Legend-class Enemy guards the Society from all would-be attackers,and so the Seven Kings meet in order to devise some means to defeat the Enemy,and the Acceleration Research Society along with it.The secret plan they come upwith requires Silver Crow gain a new ability, Theoretical Mirror.Although he'sbeen ordered to obtain this ability--which can withstand even the instant deathof Metatron's ultimate laser--abilities require action to trigger theirmanifestation, in contrast with the way Incarnate techniques are generatedthrough the imagination. Thus, Haruyuki's powerful imagination isn't going tohelp him obtain Theoretical Mirror.While Haruyuki is stumped at how to evenbegin this difficult task, Ardor Maiden aka Utai Shinomiya starts to talk abouta sad past...