The music-listening companion iOS app Music Girl Hatsune Miku is now live on the Japanese iTunes App Store. The app features Miku, who bops to songs you play from your music library. The animation was made by MARZA ANIMATION PLANET, who also worked on Project DIVA and Project DIVA 2nd. Listening to songs helps level up Miku, and her affection for the user goes up if the user manages to do things like answer her quiz questions correctly. The basic app is free (and thus only a Japanese iTunes account is required and not a Japanese credit card or iTunes points), but extra outfits are in-app purchases. Currently, a “Spring Wind” outfit set is available for 350 JPY, with “Summer Wind” and “Fall Wind” costumes planned for future release.