Fairy Tail season 6 episode 21
Episode title: Tartaros Chapter - Alegria
Just when Mirajane is about to succumb to Seilah's Macro, she remembers a series of events in her childhood that could provide a clue to turning the tables on the Etherious demon. Then Mard Geer makes his move to neutralize all the Fairy Tail wizards and even scores of Tartaros soldiers on the Cube.
