This soundtrack is the one that is bundled with the Playstation 2 version of Pop'n Music 12 Iroha.
The soundtrack that I'm looking for consists of three tracks that has the long versions of:
Dappi~Knockout Regrets by MAKI @TOGO.BAND, Boku no Namae wa Yuuki by Yuuki., and Futari no Manifesto by Yoshihiko Koezuka.
I would be very grateful if someone can meet this request.