ローリンガール (Rolling Girl)

Rolling Girl is a song by Wowaka and sung by Hatsune Miku. This song hit #2 on the Weekly Vocaloid Ranking the week after it debuted in the Rankings
 * Nicovideo Broadcast
 * Youtube Broadcast

Background
The lyrics are very vague, but the general idea is that a girl with far-off dreams and a history of constantly "failing" takes to "rolling", even though her goal is still too far away and she would rather "stop her breathing". In the end, she is comforted by an unknown person/people.

Another meaning is that a girl is shunned for being different. She turns to her friend who is presumed to be a male, who reluctantly promises to help her commit suicide/help her run away when she can't take it anymore. "Rolling" is presumed to mean that shee keeps on pushing through.

Trivia

 * Miku debuted a new Rollin' Girl inspired outfit during the “Mikupa♪ Hatsune Miku 39′s Live in Tokyo 2011 Concert”. The outfit seems to combine aspect of the Original PV (the crescent moon patterns of the original illustration) with the Akiakane & Yama_ko's PV (the high-school themed uniform). This outfit hasn't appeared as a Module in any of the Project Diva games, yet.