If you want the ending of the story, then unlock it.

If you want to see the ending of a game, then beat it.

Idk why people cry about not getting content given to them on this game, but not others. How would you sound if you were playing FF12 or something and were like "I can't beat the last boss but I want to know how the story ends, they should patch in a way to skip the boss to the end of the story, or just make the boss even easier."