It might just be the feeling you get from watching crossovers, but seeing how your favorite characters interact with each-other, in an otherwise impossible situation is something thoroughly enjoyable. Natsu and Haru are very similar in characteristics and several other members of Fairy tail and Rave get along with their similar characteristics.
As this is only a single episode, I can't really give much info. But I can safely say, that whether or not you're a Rave or Fairy tail fan (or Both) you will definitely enjoy this episode.
