Fairy Tail

Moon Drip (1x12)

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Natsu, Lucy, Gray, and Happy uncover a plot to release a demon that wrecked havoc years ago and was only stopped by Gray's former teacher who sacrificed herself to seal away the beast. They meet up with the wizards responsible and a fight breaks out between Gray and a masked wizard who turns out to be Lyon, a person from Gray's past. Meanwhile, Erza makes her way to the island.