Chitose Nakai, the ancient zashiki-warashi guardian of Yuragi Inn, has overseen the establishment’s fortunes for centuries. Though her appearance mirrors a petite 13-year-old—130 cm tall with hazel-brown bob-cut hair, amber eyes, and a slight frame weighing 34–39.4 kg—her true age spans over a millennium. She deliberately cultivates the illusion of a middle schooler, covertly attending classes at a local school with aid from Tsutomu, her childhood friend turned principal. This clandestine education allows her to fulfill a yearning for human connection and ordinary friendships, a pursuit she initially conceals from the inn’s residents.

Beneath her cheerful, energetic demeanor lies the wisdom of centuries, positioning her as both a nurturing maternal figure and a stabilizing force within the inn. While generally pacifistic and impartial, her temper can shift swiftly to intimidation when provoked. Her interactions blend warmth with a sense of duty, exemplified by her pivotal choice to name the spectral inhabitant of Room 4 as Yuuna Yunohana—a decision that reshaped the inn’s legacy.

Chitose wields the power to manipulate fortune, granting others fleeting luck or misfortune, though each act triggers an unpredictable delayed backlash. This risk renders her cautious in using her abilities. Her role as caretaker is further defined by domestic expertise, excelling in cooking and cleaning to maintain the inn’s harmony.

Her history intertwines deeply with Tsutomu, who once naively proposed marriage to her as a child. Decades later, their bond endures as a platonic partnership, with Tsutomu enabling her academic charade even as he ages and she remains unchanged. This dynamic highlights her timeless existence, caught between supernatural obligations and a quiet longing for mortal experiences. While her story avoids overt transformation, her gradual willingness to reveal her secret school life hints at subtle growth, reflecting her struggle to reconcile duty with the fleeting joys of humanity.