Akuma no Riddle, Cross Ange: Tenshi to Ryuu no Rondo Recommendations
At a private girl school, Myojo Accademy thirteen girls are transferred into the accademy`s Black Class. Of the thirteen students, twelve are assassins from various surroundings who are all tasked in assassinating the remaining one, Haru Ichinose. If they succeeed, they will be granted any wish they desire but they failed, they are expelled from the class. One of the executioner, Tokaku Akuma develops feeling for the latter which result in protecting her against the other assassins.