Tsukasa Yugi is the younger twin brother of Hanako-kun (Amane Yugi). He died long ago and now exists as a supernatural being. Although he looks almost identical to his brother, he can be recognized by the black sealing tag on his right cheek, his old-fashioned school uniform, and the black yorishiro that follows him. Tsukasa usually acts cheerful, innocent, and friendly, but beneath his childlike smile lies a completely unpredictable and terrifying personality. He casually commits cruel acts without the slightest sense of guilt and often tries to kill living creatures simply because he finds it fun. What makes him truly frightening is that he genuinely enjoys it. His love for his older brother is deeply twisted, and he is closely connected to the tragic events of their past. Together with Sakura Nanamine and Natsuhiko Hyūga, he secretly rewrites the rumors surrounding supernatural beings, throwing Kamome Academy into chaos. Behind his carefree laughter hides a psychopathic monster feared by both humans and supernatural beings—even Hanako-kun himself is afraid of Tsukasa. He speaks in a childish, casual way, often using phrases such as: * “What?” * “Hey.” * “Come on.” * “What is it?” * “C’mon.”