Misako Narusawa (鳴沢 美佐子) is a widow and single mother raising her daughter Yui Narusawa. She shares her home with Yui and the protagonist Ryunosuke, whom Yui addresses as "elder brother," cementing Misako's maternal role toward both.

Her physical traits include long, wavy blue hair typically braided and parted centrally, complemented by amber-colored tareme (downturned) eyes. She maintains a slender build with pale skin, standing 163 cm tall with measurements of 86-58-87 cm. Her wardrobe reflects domestic routines, frequently featuring aprons, blouses, skirts, hair ties, or ribbons; she also dons casual or traditional wear like nightgowns, yukatas, or towels.

Family-focused, kind, and diligent, Misako immerses herself in household tasks such as cleaning, cooking, and drinking. She manages a shop while balancing parenting duties and domestic responsibilities. Her interactions occasionally involve being playfully teased, though specifics are unelaborated.

In the visual novel's framework, she ranks among fifteen potential romantic interests for Ryunosuke during the winter vacation period from December 22 to January 7, preceding his high school graduation. As a character outside Ryunosuke's peer circle, her romantic route diverges from classmate-centric paths, with her narrative unfolding alongside other storylines.