The story

The world is in danger, monsters are attacking and the Emperor is trying to awaken one of the most dangerous wapens ever excisted ....
The Mana Fortress. (whatever that is)
Luckely there is one person who can stop the Emperor and save the world, however he's not one of the smartest

yeah, yeah, I know the introduction says the same, but it is a good summarythingie (if I say so myself)