Hitsugi Kirigaya is one of the main characters of the manga and anime series Akuma no Riddle. She is a former student of Myojo Academy's Black Class.In the anime seried she is also known under the alias Angel's Trumpet, the one that killed Chitaru Namatame's former teacher's daughter. In the final episode, she and Chitaru are alive, and she seems to be trying to patch things up between them.
- She seems to be always smiling near Chitaru
- She is helpful to Chitaru.
- At episode 6, she sacrificed herself for Chitaru, stabbing herself at the stage after she revealled her secret that she was the Angel's Trumpet Chitaru was after.
- At the ending, She said that Chitaru's blade that pierces her bosom will not tear them apart.
- She states that Chitaru has a wonderful beauty.