Fairy Tail Series 2 Episode 47: Transform!
Episode 47 of 102 of Fairy Tail Series 2, aired February 27, 2015, 25 minutes. Available with English subtitles and dub where released.
Episode summary
While Mira teaches Lucy, Natsu, and Happy basic Transformation Magic, Erza does her own transformation while shopping... into Fairy Woman! And a superhero may be just what's needed when two other Fairy Tail members are turned into supervillains!