Sora, Hajime, and all of their friends now embark on a strange adventure in another town, after helping a caravan that's been ravaged by bandits and Heartless. However, things are about to take a very unexpected turn for our heroes, even though the rogue gunner's still royally based in his desire to return to his original world with the people at his side.

As Sora, Hajime, and all of their friends continue their journey through Tortus, the demon lords prepare themselves for a new war, thanks to their alliance with Sephiroth and the Dark Council in Niflheim, headed by Maleficent and Ardyn Izunia. But they must face newer tests, and ensure that those who are most precious are never taken from them by their enemies.

In another world, where a band of students have been summoned by an unknown force, Sora and his friends must now join forces with a group of students who are tasked with becoming heroes. However, Hajime Nagumo is betrayed, and cast down into the dark abyss by one of his classmates who have become another of Sephiroth's apprentices. Now, a new battle for survival begins.