Chitomi Egawa holds the position of eldest head maid at the Miyanomori household. She oversees the staff and monitors maid activities to ensure meticulous household management. Standing 153 cm tall and weighing 48 kg at 58 years old, she possesses long grey hair typically secured in a bun and black eyes. She wears a traditional white and pink kimono.

Her personality blends strictness with underlying kindness, reflected in a serious work ethic and her guidance of the staff. She shares a motherly bond with the six Miyanomori brothers, caring for their well-being regardless of their privilege. This care extends to the protagonist, Haru Asagi; Chitomi encourages Haru during distress and acts as her mentor. Chitomi personally recruited Haru after encountering her during a search for new maids, facilitating Haru's entry into the estate.

A personal tragedy marks her past: the loss of her young daughter to illness, which informs her compassionate demeanor towards the staff and Miyanomori siblings. She demonstrates absolute dedication to her duties, considering work her primary hobby. Chitomi values discipline and efficiency, balanced by genuine concern for those under her supervision.

Within family dynamics, she serves as a stabilizing influence during conflicts among the brothers or household challenges. Her role remains consistent, emphasizing her position as a respected and enduring figure. Her surname, Egawa, translates to "bay, inlet" and "river, stream," while her given name, Chitomi, combines the characters for "thousand" and "wealth, abundance," symbolizing her experience and integral role. No significant character development or altered responsibilities are documented beyond this core portrayal.