Misako Narusawa is the mother of Yui Narusawa, living with her daughter and a young man named Ryunosuke. Though not biologically related to Ryunosuke, their shared household places her in a non-biological family role. Yui refers to Ryunosuke as "elder brother."

She has blue hair, typically styled in a long, wavy braid parted in the middle. Her eyes are amber-colored and possess a "tareme" shape, giving them a gentle, drooping appearance. She maintains a slim adult figure with pale skin, standing 163 cm tall with bust-waist-hip measurements of 86-58-87 cm. Her wardrobe features practical, everyday items including an apron, blouse, skirt, nightgown, yukata, and hair accessories like a ribbon or hair tie.

Her personality includes kindness, a strong work ethic, and a focus on family well-being. As a widow and single parent, she independently carries household responsibilities. She manages a shop, fulfilling her provider role. Her daily activities center on domestic tasks such as cleaning, cooking, and preparing rooms via turndown service. She also engages in social drinking. Interactions with others sometimes involve her being the subject of teasing.

Her background story remains consistent across related media; she shows no significant development, maintaining her established roles as mother, homemaker, and shopkeeper. Her presence contributes to the domestic setting and relational networks, particularly through her connection to Yui and Ryunosuke's living situation.