Yuu Fujikura is a maid in the Arima household, primarily tasked with attending to heir Teppei Arima. She exhibits exceptional computer proficiency, achieving near-superhuman typing and data processing speeds alongside her regular duties. Her background traces to an orphanage upbringing until Isshin Arima provided her care and education, molding her into a capable maid. This fostered deep gratitude, resulting in a lifelong vow to serve the Arima family in repayment. She views her assignment to Teppei as a special privilege. Physically, Yuu stands 160 cm tall with measurements of 84-58-83 cm (bust-waist-hips). She has short, dark black hair, amber eyes, and a pale, slim build. She typically wears a maid uniform or school attire, often accessorized with a maid headdress and garter belt stockings. Her personality is kind, loyal, refined, and nurturing, with Teppei noting similarities to his mother's demeanor. Despite developing tender feelings for him, she harbors persistent insecurity over perceived class differences, feeling unworthy of romantic attention due to her servant status. She regards Isshin Arima with parental respect. Beyond household service, Yuu maintains friendships with Charlotte Hazelrink, Sylvia van Hossen, and Seika Hōjōin, connections formed within the school environment shared with Teppei and the other heroines. Across different media narratives exploring her romantic storyline, Yuu's character route sometimes concludes with Teppei experiencing a vision. This vision depicts her pregnant, welcoming him home alongside his deceased parents, signifying family integration and future continuity.