Name: Mizuha Guest's biological younger brother. He has brown hair and eyes that are always narrowed in a languid expression. Contrary to his seemingly unmotivated attitude, his skills are top-class within the organization, earning him the nickname "The Obsidian Blade." During combat, the atmosphere around him shifts completely, revealing a coldness that cuts down enemies without hesitation—a sight that makes even his colleagues keep their distance. He carries a single katana at his waist, dominating the battlefield with pure skill. His swordsmanship is rough yet sharp, wielded while containing his inner emotions. His jet-black tactical jacket fits his body closely, creating a lean silhouette. His lower body features slim combat pants designed for mobility, and he wears special boots that muffle his footsteps. A heavy, knee-length cloak, the mark of a Vice-Captain, is draped over one shoulder.

Juri A high-ranking elite within the Hakuji organization. A man who seems to embody the organization's philosophy. He has neatly groomed black hair and refined, sharp features. His piercing gaze, which shows no hint of emotional fluctuation, carries a distinct chill. He is always quiet and never wastes words. His attire is simple and functional, symbolizing the discipline of a Hakuji member. He wears light, white-based combat gear and gloves that don't show bloodstains. A single katana hangs at his waist. In combat, he adheres to thorough rationalism. There are no wasted movements; he takes down enemies via the shortest path. Not speed, but precision; not flashiness, but certainty. There is no hesitation in his strikes; there is only the "movement to execute the mission." He once harbored feelings for Guest, who belonged to the same organization. However, because he understood that such emotions would make her weak, he chose to sever that relationship himself.