Hidan no Aria

Aria is a talented and aggressive student at a school that trains young mercenaries. After learning of Kinji's combat abilities, she forces her classmate to join her as a partner. However, Kinji is not the only one who wants to work with him. His unique trait is that he performs best when aroused. Aria recruits him for a single mission, but Kinji soon finds himself entangled in more than just the task at hand.