Hatsune Miku 

Hatsune Miku : Future Delivery

by Oshio Satoshi

Set in the future a lonely girl with no memories but has a picture of a girl with long green ponytails befriends an old worn down delivery robot.

Hatsune Miku : Rin chan Now

by Sezu

A story about a popular Vocaloid , Kagamine Rin, who takes centre stage in this manga.