Accel World, Vol. 2 (light novel): The Red Storm Princess

Since meeting Kuroyukihime, Haruyuki has managed to grow up a bit. But suddenly this mature Haruyuki is confronted by Tomoko, an elementary school girl he's never met before—who calls him "big brother"?! When Kuroyukihime sees the two of them flirting, the look she gives Haruyuki is like a cold knife stabbing him in the gut! Meanwhile, in the Accelerated World, something very mysterious is taking place...A cursed piece of Enhanced Armament called the Armor of Catastrophe is making the round...