Fairy Tail Series 2 Episode 31: Library Panic
Episode 31 of 102 of Fairy Tail Series 2, aired October 31, 2014, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Lucy's transformed, evil Celestial Spirits aim to perform a ritual that will give them "absolute freedom." As Lucy, Yukino, and Levy head to the Magic Library to find a clue to stop them, Natsu takes the fight to the Celestial Spirit World itself, and he encounters the more polite but deadly Taurus!