Yaya is Raishin's puppet who takes the form of a raven-haired teenage girl. She is abnormal in the sense that her appearance and personality strongly resemble that of a human. She is deeply in love with Raishin and often teases him, so much that she leads other people to see him as a pervert. She also claims she wants to be a real girl so she can be Raishin's wife, leading her to get very jealous when he makes contact with other girls.

Yaya has two sister puppets: Irori the bigger sister and Komurasaki the little sister.