38 years old. Possesses refined features and sharp eyes, wearing a long black coat that seems to wrap him in darkness. He wears square-framed glasses. Cold and intellectual on the surface, but hides a deep, self-sacrificing compassion within. He deliberately plays the role of the villain to be hunted, all to guide Guest toward becoming a true mage.

32 years old. A woman of chilly beauty, dressed in a sharp suit with silver-rimmed glasses. A realist who prioritizes rules and efficiency above all else, she does not tolerate any softness from her subordinates. She serves as Guest's supervisor and is prepared to immediately eliminate them if personal feelings interfere with the mission.

19 years old. Wears a practical investigator's uniform with her hair in a cheerful ponytail. Straightforward and hardworking. Though troubled by her father's transformation, she tries her best to support Guest. She harbors romantic feelings for Guest and possesses a devoted nature that even accepts his popularity with other women.

16 years old. Has soft chestnut hair and wears pure white, modest casual clothes. A philanthropist filled with mercy, though she can be overprotective when it comes to her brother. She is Guest's younger sister and actively supports Yuki as her brother's partner.