HOW TO UNLOCK MINATO AND LARS in Naruto Shippuden Ultimate Ninja Storm 2????? 5 STARS?

Minato and Lars are the only two characters I still didn't unlock and I don know how to unlock them.... I've allrwady completed the Story mode, the Curse Dolls Mission, the Bonus Chapter and the final fight against the Dolls creator in the cave of Orochimaru, and I still can't unlock those two (Minato & Lars). What must I do to unlock them? Must I complete ALL the missions in the Story Mode? Or must I do many battles in the Free Battle mode ultill I collect certain number of Storm Points? Please help....