Fairy Tail
The first 29 episodes adapt the rest of the 24th volume through the beginning of the 25th volume as part of the "Sirius Island" (天狼島編, "Tenrōjima-hen") arc, which focuses on Natsu and the guild's other strongest members as they take their S-Class examination on Sirius Island, they are interrupted by the arrival of Grimoire Heart, who attempt to retrieve the dark wizard Zeref living on the island. Next 25 episodes features a completely original, self-contained story arc called "Key of the Starry Heavens" (星空の鍵編, Hoshizora no Kagi-hen), and focus on Natsu and the members of Fairy Tail as they meet a relative of the Heartfilias', and face a religious sect of warriors and a revived Oración Seis as they try to find the parts to an ancient doomsday weapon.
Natsu is imprisoned inside the Zentopia stronghold... along with the Jiggle Butt Gang! Back home, the Fairy Tail wizards are visited by a few members of the Archaeological Society, who shed some light on the Infinity Clock and what it does. Finally, Oracion Seis has Lucy and are going to use her as the final element to activate "Real Nightmare"!
Cardinal Rapowant's devious plans begin coming to fruition as time itself warps, affecting even the Fairy Tail members aboard Ichiya's Christina. En route to rescue Natsu and Lucy, they become children, elderly, and even different species!
As Natsu and other Fairy Tail members race to save Lucy before she's sacrificed by the new Oracion Seis, Gildarts has a non-magic showdown with Byro. They also learn the secret of Cardinal Rapowant, that even he didn't know!
As Lucy is slowly being sucked within the Infinity Clock, Imitatia faces off against Natsu, Elfman and Coco. In addition, every other member of Fairy Tail starts working to stop the Infinity Clock from bringing forth chaos and to find the runaway Kinana. Erza and Cobra continue their match. Gray and Dan Straight face off against Angel, whose self-titled Magic proves to be more dangerous for her than it is for her opponents.
The battle to rescue Lucy from the Infinity Clock rages on, but it may be too late as Lucy becomes one with the clock! Plus, the climactic battle between Erza and Cobra!
Only Brain II is left standing between Natsu and Lucy, but he's the most powerful of the Six Generals! Also, learn the secret history of Lucy and Michelle in this epic finale to the Key of the Starry Heavens arc!
