Akuma No Riddle

Happy-go-Iucky Haru lchinose is an upbeat, all-smiles kind of girl. At a prestigious all-girls boarding school, Haru is one of the most popular girls on campus. The attention paid to her, however, is about to turn deadly. Enter Tokaku Azuma, a cold-blooded female assassin, who moves from one mission to the next with deadly precision.