Miyuki Kujou is the personal maid to Kimito Kagurazaka at the elite all-girls school Seikain Jogakkou. She possesses short black hair, blue eyes, and a distinctive mole beneath one eye, typically clad in her maid uniform. Miyuki maintains an impassive facade and emotionally reserved demeanor, yet harbors a sadistic streak, often meting out severe punishment for Kimito's errors. Despite her harsh exterior and verbal disdain, she secretly exhibits affection, such as kissing Kimito each morning to wake him.

Her background centers on a significant childhood connection to Kimito. Miyuki's older brother, Kujou Itsuki, bore a strong resemblance to Kimito, allowing them to temporarily switch places. During this period, the previously lonely and timid Miyuki, alienated by her wealthy status, formed a deep bond with Kimito, whom she affectionately called "onii-chan." He provided the familial trust and warmth she lacked with her actual brother. After the boys switched back, Kimito contracted a severe illness that erased his memories of Miyuki and their shared time.

Spurred by Kimito's offhand comment about liking maids, Miyuki later orchestrated his selection as the "commoner sample" for Seikain. Despite her own affluent background, she insisted on becoming his personal maid, driven by a desire to reconnect. As the series unfolds, Kimito gradually recovers his lost memories. This leads to a heartfelt reunion where Miyuki displays her first genuine smile in years, signaling emotional resolution. Her character subtly evolves from aloofness to moments of vulnerability tied to their shared past.