Yuki Kaai is a Japanese Vocaloid character introduced as part of the VOCALOID2 engine. She is depicted as an elementary school girl with a sweet and innocent appearance, often wearing a school uniform and red scarf. Kaai Yuki's voice is provided by a real elementary school student, which gives her a youthful and unique tone among VOCALOIDs. She is not a character from an anime series, but is widely used in music production and fan works, often portraying a cute, cheerful, and energetic personality.