Fairy Tail follows the plot of the anime, set from around the end of the Tenrou Island arc to approximately the end of the Avatar arc. For the uninitiated, that spans around 160 episodes from about 122 onwards. You’re therefore much better off going into Fairy Tail with some knowledge of the property already, but there is an in-game encyclopaedia with plot reminders and a glossary of terms which will help familiarise the unversed. Though Fairy Tail does retread old ground, and for the most part does it very well, some points are skipped over for brevity and emotional depth is often lost as a result.