The protagonist in Azuma Tokaku's book The Devil's Puzzle, age 15, attendance number 1. One of the assassins who entered the class on the first day of class. A cold, expressionless girl. I prefer to act independently rather than collude with others. He was assigned to the same dormitory as his assassin Haru Ichinose. After repeated communication, he was gradually attracted by her and became Sunny's "guardian", fighting against other 1 1 people. The weapon is a knife, and his fighting skills are excellent. He has overwhelming strength in the face of INUKAI ISUKE, but he has no experience in killing people, and his hands tremble before killing people, which makes him unable to kill the target. The reason is the dark history of her youth.