STORY :
You wake up from a long coma in a hospital in Midgar, and don't remember anything. then a nurse tells you that you have been found in a desert wounded by a mystical energy.
You have a sword and armor which look normal (YET).
you have to discover your past by passing the story, also you face new events... a walk through past and present in same time.
I mean, while you are completing your adventure, you are also discovering your past.
By passing times, you recover your old powers ( For example at LV 60, you'll face a man and ..... then receive 5 Levels and a spell or technic at Level 5 )
After reaching the last boss and when you can not defeat it in anyway, you will remember the true power of your sword(which you had as a normal sword at the first... Un-droppable item ) and will defeat the demon using it.
Its just a main story, and the rest can be completed by different ideas.
You wake up from a long coma in a hospital in Midgar, and don't remember anything. then a nurse tells you that you have been found in a desert wounded by a mystical energy.
You have a sword and armor which look normal (YET).
you have to discover your past by passing the story, also you face new events... a walk through past and present in same time.
I mean, while you are completing your adventure, you are also discovering your past.
By passing times, you recover your old powers ( For example at LV 60, you'll face a man and ..... then receive 5 Levels and a spell or technic at Level 5 )
After reaching the last boss and when you can not defeat it in anyway, you will remember the true power of your sword(which you had as a normal sword at the first... Un-droppable item ) and will defeat the demon using it.
Its just a main story, and the rest can be completed by different ideas.
.....yet 

Though exactly what and why is beyond me at the moment.