Happy Girls Collection (ハッピーガールズコレクション)

Happy Girls Collection is Ishifuro's major second album, which is published by IA PROJECT.. The songs are sung by Kagamine Rin, SF-A2 miki, and IA. Tracks 2, 9 and 11 are new songs, tracks 4, 5, 8 are re-released while track and 10 is a cover.

A crossfade for the album can be seen on and.