Fairy Tail Series 2 Episode 91: The Fairy in Your Heart
Episode 91 of 102 of Fairy Tail Series 2, aired January 8, 2016, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Natsu and Happy make a pilgrimage to Tenroujima, site of Mavis Vermillion's grave. This sets the stage for the origin story of Fairy Tail, with a six-year-old Mavis caught in the middle of a bloody war between two guilds on the island.