Birthday Song Series Special Disc

This album is an included bonus for buying all the Birthday Song Series albums from select stores. Happy Happy♪ Birthday Song in this release is sung by Cocoa Hoto, Chino Kafū, Rize Tedeza, Chiya Ujimatsu, Syaro Kirima, Maya Jōga, Megumi Natsu, Aoyama Blue Mountain, and Mocha Hoto.