Hatsune Miku is a virtual idol. She exists in the virtual space.
In the latest Kids React, a group of kids react to the singer.
Footage is shown of the Sega-produced Miku concert, and the
kids, while initially WTF-ing, do offer up some insightful and
open responses about the virtual popstar, as well as some kids
who couldn't quite get their head around the notion.  Toyota
adopted the virtual singer for an awkwardly Westernized ad
campaign.  Kids React to Hatsune Miku [DannyChoo.com]