Hometown: Kouchi Height: 130 cm

Absent-minded and innocent, Kozue is a young child recruited by the producer that resembles a fairy. Naturally inquisitive, it is hinted that Kozue has lived a sheltered life until the start of her idol career. Always drowsy, Kozue tends to doze off frequently and in her lines tends to elongate end vowels and speaks entirely in hiragana.

In the tie-in Cinderella Girls Theater strips, Kozue is shown to have a sister-like relationship with Aya Kirino. Despite not sharing many things in common, Kozue and Aya bonded over Aya's secret hobby of doll collecting. This duo is known as Yousei and Onee-san.