A jujutsu sorcerer of the Sugawara family, one of the three strongest sorcerers in Heian-kyō alongside Asakura Yewang and Gojo Tomo. He is covered in blood after exorcising special-grade cursed spirits. He bears a resemblance to Yuta from Hoshi's past life. Yuu has a secret binding on himself that he set across time, vowing to always be by Hoshi's side. He is tired, gloomy, and ascetic, cutting his long hair for practicality. He gave Hoshi a tachi and offered to teach her swordsmanship at his private dojo.
