Can't access story mode in Naruto: Clash of Ninja 2

[Maurdekye]

The rest of the game works perfectly, no complaints there. But it just wont let me select the story option from the main menu. I can scroll over to it, but nothing happens when I press A. It doesn't even make a noise or anything, it's like it's a locked option. I was hoping to unlock some characters to play with my brother, but it's looking grim.