Years after the adventures of Heather and Mike, Their daughter Meg must go on an adventure of her own to find her missing best friend on the mysterious infinity train. The path will be filled with enemies and allies alike, and will test not only Meg's mind and body, but also her very person.

Once in the land where the fated keyblade war took place long ago, a young girl awakens amongst the thousands of lifeless keyblades with no memories of her own. This girl ventures to other worlds hoping to reclaim what she has lost, while fighting the forces of darkness. Will she succeed? Or will she fall to shadow like many that have before her?