This is for Completing the first Arc of Story Mode. It isnt too crazy. There are a set number of maps with enemies on the grid. You have a select amount of turns to complete the map. Defeat enemies to level up your character and complete the boss battle to move on. The only other thing worth mentioning is damage carries over. There is a recovery bonus for winning which is usually enough for the normal modes but you will need to swap out characters on your team for new ones to allow the health bar to regenerate. If all you characters die, you have to restart the map from the start.