This season was filler. I sort of liked it but not as much as the other seasons, but when the filler ended it's almost completely ignored and in fact some of it contradicts what happens later, or won't happen until much later. As such it was a bit of a letdown. You can skip this season and keep going, the rest is fantastic. It's unfortunate that the animation is a little low quality... you get used to it and it's worth it for the storyline and adventure but this series deserves better than this. One thing this filler adds to though, is the premise that youonly get by reading the synopsis before the show or researching the background for it.

Overall, the filler is fun and a little more lighthearted than the rest but is totally optional.