Mafuyu Kirisu teaches at Ichinose Academy as a student counselor and former tutor to Rizu Ogata and Fumino Furuhashi. She presents as a stern woman in her mid-twenties with pink hair, green eyes, and a slender athletic build from her competitive high-school figure skating career, which earned her numerous awards. Professionally, she wears formal suits with black stockings and dark red high heels, often carrying textbooks or student files. Privately, she favors comfortable tracksuits in her perpetually disordered apartment.

Her cold, strict demeanor leads students and colleagues to perceive her as unsociable and harsh. This facade crumbles in her personal life, revealing profound domestic incompetence: she requires help cleaning her chaotic living space, exhibits clumsiness causing frequent self-injury, and possesses notably poor cooking and housekeeping skills. Initially, her educational philosophy prioritized natural talents over emotional desires, clashing with tutor Nariyuki Yuiga. This stance originated from abandoning her skating future after Teruaki Yuiga—Nariyuki’s father and her own former teacher—inspired her to pursue education, a decision that strained family ties despite admiration from her younger sister Miharu.

Mafuyu evolves by recognizing the merit in Nariyuki’s tutoring approach, apologizing to Rizu and Fumino for her rigidity, and supporting unconventional student paths. Her vulnerabilities include a fear of cockroaches, low alcohol/spice tolerance, reckless driving, habitual two-character speech openings, and underlying loneliness despite teaching proficiency. A pivotal memory resurfaces of her comforting a lost young Nariyuki during a school festival fireworks display years prior, where he vowed to stay with her so she wouldn’t feel sad. As adults, she develops suppressed romantic feelings for him during his student years. After his graduation, she accepts a university position near him, coincidentally becomes his neighbor, and they eventually marry, both teaching at Ichinose Academy.

Her journey transforms her from an isolated perfectionist to someone embracing emotional bonds, reconciling with estranged parents, openly caring for students, and overcoming barriers to forge lasting relationships. This arc reflects professional dedication masking personal insecurities, resolved through mutual support and vulnerability.