Another Wiki about Rolling girl.
So... Hatsune Miku made it for stop bullying. Actually the story about "Rolling girl" is about she was being bullyed by a boy. She is being bullyed strictley, she tried to fought back but she can't. Sooner or later she was brave to be bullyed. She let the boy bully her. But the boy saw is not crying and she looks poor. It's looks like a a girl after a boxing match. She said "You can bully me because I'm a toy of yours. I will not cry." She said it poorly. Then the boy hugged her. It means he also has a heart. She was shoked. After that he stoped bullying. End