CHIBA--Hatsune Miku has always been ... to showcase her standard high-pitched, cutesy voice. For sale are a special Seiko watch and a series of dolls in the character’s likeness.

virtual singing idol Hatsune Miku. “This is my wife, Miku,” the 39-year-old school clerk said, showing a life-size Miku doll sitting on a folding chair with her signature long turquoise ...