48 episodes · 2009

The season adapts the first 16 volumes of Hiro Mashima's Fairy Tail manga series. Natsu befriends Lucy who joins the titular guild and later goes on missions with her to earn money along with fellow wizards Gray Fullbuster and Erza Scarlet, as well as Natsu's flying cat, Happy. The five go on a forbidden S-Class mission with Gray and Erza to save Galuna Island and fight Gray's rival Lyon Vastia. Shortly after, the guildhall is attacked by their rival guild Phantom Lord, leading into a guild war. After the dissolution of Phantom Lord, the group learns of Erza's past as a slave in the Tower of Heaven and confront Jellal Fernandez to destroy the tower. Lastly, once back at Fairy Tail, Natsu and the others face Laxus Dreyar and the Raijin Tribe as they stage a coup in Fairy Tail.

48 episodes · 2010

The first 20 episodes make up the "Nirvana" (ニルヴァーナ, Niruvāna) arc, which adapts Hiro Mashima's Fairy Tail manga from 16th through the middle of the 20th volume. The arc focuses on Fairy Tail's alliance with other guilds to take down the dark guild Oración Seis, aided by the Dragon Slayer Wendy Marvell and a reformed Jellal Fernandez. The next 4 episodes form the self-contained "Daphne" (ダフネ, Dafune) arc, where Gray Fullbuster seemingly betrays the guild and helps Daphne, a deranged wizard, capture Natsu to power an artificial dragon. The last 24 episodes adapt the rest of the manga's 20th volume through the beginning of the 24th volume to form the "Edolas" (エドラス編, Edorasu-hen) arc, wherein the guild becomes trapped in the parallel universe Edolas to be used by the world's ruler Faust to restore magic to his kingdom, and set out to return to their world with the aid of Faust's son Mystogan and Happy's race of winged cats called the Exceed.