Noriko Nijō attends Lillian Girls' Academy, a Catholic institution, her enrollment spurred by unforeseen events that clash with her deep fascination for Buddhist statues and art—a cultural contrast embodied in the school’s traditional uniforms and refined etiquette. Initially unsettled by Lillian’s formal atmosphere, she challenges conventions through informal speech, addressing her mentor Shimako Tōdō as “Shimako-san” rather than the expected “Shimako-sama” and adopting casual language in private. Beneath her composed demeanor lies a direct, assertive nature, starkly opposing Shimako’s quiet reserve. Noriko’s jet-black, unadorned hairstyle mirrors her traditional aesthetic, contrasting Shimako’s Westernized elegance. As Shimako’s petite sœur, she navigates her role in the Yamayurikai student council, forging bonds like her supportive friendship with Tōko Matsudaira. Over time, Noriko integrates into Lillian’s social fabric, expanding her connections through interactions with figures like Sei Satō. Her journey balances personal passions with the responsibilities of mentorship, illustrating her resilience in preserving individuality while deepening ties within the academy’s close-knit community.