The secret of Natsu is revealed in the "world of the past"!? Guided by a "magic book" that had been sleeping in the guild's warehouse, Natsu, Lucy, Happy, Gray, and Erza have time-slipped into the past!! They immediately encounter their past selves and former companions, hinting at a huge commotion to come!! Will Natsu and the others be able to return safely to their original world!?