Lost Heroes - PSP

Suddenly, the heroes find themselves lost in a mysterious world, a den of evil... and they fight back. However, they are overwhelmingly outnumbered... that's right, they have lost their true powers. These heroes were never meant to cross paths. Is there any meaning to their being gathered together? Where is this place... why have they lost their powers... can they return to their world? Without knowing anything, powerless justice steps out into an unknown world like a lost child.