Chieko acts as manager of Amamizukan, an apartment building sheltering a group of socially anxious otaku women called the Amars or Sisterhood. She handles this role because her mother, Chiyoko, owns the building but is rarely present, consumed by her fandom for Korean actor Bae Yong Joon. Chiyoko frequently travels to Korea and ultimately decides to sell Amamizukan to fund a permanent move there. Physically, Chieko has a short to medium stature with a rounded figure, a round face, a noticeable double chin, long dark hair usually tied back, and glasses. Her most defining trait is her exclusive use of traditional Japanese attire, primarily kimonos and yukatas, which she handcrafts herself. This reflects her deep passion for traditional Japanese culture and aesthetics; she adamantly states she can only create traditional garments and lacks knowledge of modern fashion. Her appearance, especially surrounded by her collection of traditional Japanese dolls, sometimes causes her to blend in with them, an effect noted by others. Within the Amars, Chieko exhibits the most pragmatic and level-headed personality. She keeps a level head during crises, like being the last to withdraw from a heated redevelopment meeting about Amamizukan's future and later helping manage chaos during an in-house fashion show. She demonstrates significant social intelligence, strategizing alongside the Sisterhood and Kuranosuke Koibuchi to persuade both her mother and real estate developer Shōko Inari to abandon the sale. Despite sharing the group's anxiety around stylish people and men, she forces herself into necessary, albeit awkward, conversations. Like the others, she lives as a NEET, relying on managing the building, online sales, and assisting reclusive manga artist Juon Mejiro with deadlines for income. She reacts strongly to threats against her cherished doll collection or unauthorized adjustments to her sewing machine. Her relationship with her mother, Chiyoko, is distant and strained due to Chiyoko's disapproval of Chieko's lifestyle and traditional interests. Consequently, Chieko, supported by the residents, feels no hesitation about deceiving her mother to protect their life at Amamizukan. Within the Sisterhood—Tsukimi Kurashita, Mayaya, Banba, and Jiji—Chieko functions as an informal leader, offering guidance and often steering group activities like the weekly grocery trip for hotpot. She shares a particular bond with Nomu, another woman passionate about crafting doll clothes, whom she recruits to help with dressmaking for group plans. Chieko respects Nomu's boundaries, recognizing when she is overwhelmed and refraining from pressure. A significant manga-specific development involves Juon Mejiro, the reclusive male BL manga author posing as a woman who barricades himself within Amamizukan and enforces the strict "no men" rule. It is revealed Mejiro harbors deep affection for Chieko and initially implemented the rule to prevent other men from developing feelings for her. This plan backfired, trapping him in his room out of fear of discovery. While Mejiro confesses his feelings, the narrative does not explicitly detail Chieko's reciprocation or the long-term evolution of their relationship.