During the chaos of war, the demon Acnologia slinks his way into the ranks. As Erza, Wendy, and Gajeel prepare to face their hardest battle yet, a strange woman shows up to lift their spirits! The woman knows the secret to sealing Acnologia away, but will the gang be able to execute her orders? Meanwhile, brothers Natsu and Zeref go head-to-head, with their lives on the line! The fate of the world sinks further into peril when Zeref reveals his ultimate mission: Neo Eclipse!