Riddle no Akuma is a manga written by Yun Kōga and illustrated by Minakata Sunao. The anime has been licensed by FUNimation in America North and by Madman Entertainment in Australia.
The story unfolds in Myojo Academy, a private boarding school for girls only. Every normal serious in that institution, if not for all the students of class 10th grade aka black group are actually disguised murderers whose goal taking life of Ichinose Haru.
