Certain Magical Index, Vol. 17 (manga)

Rambunctious little Misaka #20001-aka Last Order-knows how to find trouble. Whether it's teasing Accelerator, tormenting one of her fellow clones, or adding fuel to an already fiery day for Touma and Mikoto, Last Order's hijinks leave everyone exasperated. But her antics may just lead to some unusual first encounters, a few unexpected bonds, and some personal revelations for Accelerator!