User blog comment:KodachiZero/Hatsune Miku Collaboration (Translated)/@comment-72.193.32.166-20141006160426/@comment-25251916-20141007020955

Hatsune MIku is a known vocaloid in Japan. If you don't know what "vocaloids" are, a brief description for them would be a singing voice synthesizer.They are computer programs that is have allowed artists to create singer vocals and other sound samples.

NOTE: Miku is not from any anime but has been parodied in a bunch of others. Disregard the comment above.