Sayuki Takigawa is the devoted mother of Miu and Haru Takigawa. She possesses long, flowing dark blue hair, typically secured in a low side ponytail with a bun, and dark brown eyes. Her personality radiates selflessness and profound dedication to her family's well-being. Sayuki habitually minimizes or hides her own physical struggles to shield her daughters from worry, particularly Miu. This tendency to conceal her condition fuels Miu's concern, prompting her to persistently seek ways to assist with household duties—a direct reflection of Sayuki's ingrained reluctance to accept help despite her evident frailty.

A history of physical frailty defines her background, marked by at least two prior collapses directly resulting from overexertion in work and home responsibilities. This frailty culminates in a later collapse from overworking, leading to her hospitalization. Her absence during this hospital stay deeply impacts her younger daughter, Haru, who expresses significant distress and misses her mother's presence intensely.

Sayuki's relationships are firmly centered on her family. Her dynamic with Miu revolves around Miu's desire for her mother to share the household burden, highlighting Sayuki's persistent pattern of undertaking tasks alone. Haru's emotional reaction to her hospitalization underscores the deep closeness and dependence inherent in their bond.

Her name carries specific meanings: "Takigawa" combines "Taki" (waterfall) and "Kawa" (river), while "Sayuki" blends "Sa" (gauze) and "Yuki" (happiness).