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Kaai Yuki is a Japanese VOCALOID developed and distributed by AH-Software Co. Ltd., and was released for the VOCALOID2 engine.
Her appearance was illustrated by Umetani Atarou. She is designed as a young student of Hiyama Kiyoteru. She has black hair in short twintails (held up by hair bobbles) and her eyes are brown. She wears a red dress, white socks, and brown Mary Janes. The instrument she carries in her randoseru is a WIND MIDI CONTROLLER WX5 recorder.