Will be buying, as a Pop'n fan who already likes PSP rhythm games (DJ MAX Portable).

hmmm this is relevant to my interest! Story mode is pretty cute actually some characters always had some sort of hint of a story behind their creations.

Interesting to see how this will work

Sorry to burst your bubble, Topher, but that's no story mode. The board game-ish map is essentially Pop'n Music 15 Adventure's song-unlock method. Similar to Pop'n Music 14 Fever and a few other editions of PnM, after you finish a typical 3-song playthrough, you earn some points (depending on how many stages you clear/fail) which you then use to walk around the game board. Pick a direction at certain crossroads, and that's about all the complexity you get in Adventure mode. There's no "story" to speak of, apart from some descriptive text here and there - which most players fast-forward through anyway.

The good news, however, is that this seems to indicate that Pop'n Music Portable is essentially a port of 15 (the previous PS2 version was 14), so nearly all of the 80 songs are bound to be new stuff from PnM15, as opposed to the usual "best of" music selection found in these portable versions.