|Japanese name:|| 峰 さやか|
|First appearance:|| Yaiba Chapter 1|
Anime: OVA 1
|Japanese voice:||Kotono Mitsuishi|
Sayaka Mine (峰 さやか Mine Sayaka), usually referred to as Sayaka-chan (さやかちゃん ), is the heroine of Gosho Aoyama's second manga Yaiba. She was voiced by Kotono Mitsuishi, who also voices Kir/Hidemi Hondou.
Sayaka is a normal middle school student who has unfortunatley become wrapped up in Yaiba's adventures. She always travels with him and usually plays the straightman of the group. She seems to have feelings for Yaiba, although she is unwilling to admit it. Because she is descended from the youngest Dragon Priestess, the Moon Empress Kaguya wishes to use her body to regain her own youth.
 Plot overview
Sayaka goes with her mother to hire Kogoro when Kaitou Kid threatens to steal their treasured sword. When Kid finally breaks in he accidentally falls through her bedroom roof while she is undressing. Although defensive at first, a kiss on the cheek from Kid puts her in a love trance and she willingly tells him where the sword is.
In the original Magic Kaito chapter, she first appears when Kid falls into her room and later tries to stop her father from attacking him. At the end of the chapter she is shown treating Yaiba's wounds from his fight with Kid.