Shōko Oomori holds the official position of faculty adviser for Ebisugawa Public High School's Astronomical Club. She persistently rejects this role, attributing all advisory responsibilities to a fictional cat she designates as the true instructor. This deflection stems from her tendency to retreat from challenging realities, using the imaginary feline figure to distance herself from duties and uncomfortable situations.

Her appearance features chest-length brown curly hair and green eyes. She favors practical adult attire, typically combining turtlenecks, tank tops, skirts, belts, and stockings. Occasionally, she wears a lab coat, reflecting her formal function within the school environment.