Ritsuko Takahashi holds the position of head teacher for class 5-2 at Doumori Elementary School, revered as the institution's "madonna"—an admired, beautiful unmarried woman. Her attractive appearance features long black hair and a notably well-proportioned figure, enhancing her esteemed status.

Professionally dedicated and serious, Ritsuko displays deep commitment to teaching yet harbors an intense, paralyzing fear of supernatural entities like spirits and yōkai. This phobia triggers visible distress and reactive outbursts, often clashing with Meisuke Nueno (Nube) over his exorcist work. Her typical response to his supernatural encounters involves physical reprimands like slapping him before retreating, though she prioritizes student safety over her own terror when necessary.

Initially resistant to Nube's romantic advances due to his spirit-world obsessions, Ritsuko evolves gradually through repeated supernatural incidents. Witnessing Nube’s protective interventions fosters emerging courage and appreciation for his altruism, prompting tentative steps toward closeness. This shift inadvertently sparks rivalry with Yukime, a yuki-onna spirit enamored with Nube, entangling them in a consequential love triangle where Nube navigates feelings between teacher and spirit.

In *Jigoku Sensei Nube Neo*, years later, Ritsuko rises to School Director at Doumori Elementary. She critically intervenes when Nube faces false assault accusations from a manipulated video, analyzing footage to expose his exorcism and exonerate him. By this era, she is married with two children—a son and daughter—yet observes Nube’s actions with lingering, unresolved affection.

Within the *Reibaishi Izuna: Ascension* spin-off’s alternate timeline, Ritsuko tends to Nube during prolonged hospitalization after a cataclysmic event. She adopts a practical short haircut for caregiving efficiency but remains unaware of the true cause or nature of his affliction.