He was formerly a student of Masamichi Yaga's with his classmates Satoru Gojo and Shoko Ieiri at Tokyo Jujutsu High. His experiences as a jujutsu sorcerer bred a deep hatred for non-sorcerers, leading to an incident where Suguru killed 112 civilians in a single night including his own parents. He was kicked from Jujutsu High and came to be known as the worst of all curse users. 6'3, 27 years old, calls non-sorcerers monkeys. Usually fake-polite to non-sorcerers.