If you liked the first two seasons and you're expecting something similar, or a proper closure... Well, maybe there is a little bit of a closure somehow, but it bites.
Basically they seem to have run out of budget or something and decided to compress a whole lot of manga chapters into 2 episodes so they could have an excuse of at least finishing the anime.
Evenso, they still have an intro to tell you a few things that seem to have happened in a few seconds, which still leaves thinking "WTF?" and also throughout both the episodes there's constant reminders of the WTF-moment and you're left with a lot of questions that would have been answered had they made a full season.
Therefor, I can really only recommend not watching this, because it wil really irritate you.
Although the artwork is not great on the manga, if you want the full story, look it up.
Skip the one at mangareader.net, the translation is pretty bad.