Kyōko Hōin teaches at the same elementary school as the main characters but instructs a different class. She maintains a strict, professional, and detached demeanor, consistently enforcing school rules while emphasizing proper conduct and firm boundaries between educators and students. Her approach sharply contrasts with other faculty members, particularly when she observes teachers like the homeroom instructor for Class 3-1 acting overly familiar or lenient with pupils. Kyōko views such behavior as inappropriate and unprofessional.

She prioritizes her role within established guidelines, maintaining formal distance during interactions. Frequently seen monitoring hallways and upholding regulations, she reinforces her identity as a disciplined enforcer of order. Though not antagonistic, her exchanges remain functional and lack the warmth or personal investment displayed by colleagues. Throughout the series, she serves as a steadfast advocate for strict professionalism, providing a narrative counterpoint to differing philosophies on teacher-student relationships. Her background beyond her teaching position and professional conduct remains unexplored, with no significant evolution in her core principles across the series, OVAs, or related media. She unwaveringly upholds her commitment to professional distance and rule adherence.