Haruki is one of the main characters of the manga and anime series Akuma no Riddle. She is a former student of the 10th year's Black Class at Myōjō Academy, who was in a competition with the other students who were trying to kill Haru Ichinose, with a reward of anything the successful assassin might wish for. She joined the Black Class because she needed money to support her siblings and her mother, who was hospitalized. The reward she requested for was for her family to be fed.