Seiichirou Hara works as a mentor for apprentice mages at Tokyo's Bureau of Magic, guiding them through both magical training and urban life adaptation. He resides in a dormitory alongside apprentices like Sora Suzuki, Saori Shiraishi, and Gouta Midorikawa, enabling his supervision of their daily lives and training progress.

His mentorship stresses strict adherence to professional protocols, initially instructing Sora to avoid personal involvement with clients during assignments. However, he later acknowledges the beneficial results of Sora's compassionate interventions, demonstrating flexibility. A personal history involving a son is revealed when he corrects Sora's assumption about a dorm room's boyish decorations, clarifying it belonged to his son.

Hara supports Sora beyond magical instruction, offering stability during her emotional struggles related to her health condition and future prospects, including accompanying her through difficult times. His appearance includes piercings, consistent with his adult status and professional position. He balances upholding Bureau regulations with recognizing the apprentices' individual growth through their experiences.