Kou Kara Maou! 3rd Series is basically a continuation of the first. Yuuri still being the Maou. But this time a lot more so called 'trust' is involved.
Just like the OVA Saralegui (Sara) enters into this anime and uses sly methods to get Yuuri to do his bidding. This anime had a sense of betrayal and may be a little more emotional than the first for some people. Saralegui isn't rather friendly at the beginning of the series but then he realizes not only Yuuri's special qualities that make them help each other but that also his ______ is invloved.(Six letter word)
the basic story is a war between the Mazoku and humans. Yuuri was away for some time apparently and this caused several people to rethink who is the legitamate successor of the throne. This problem is mainly caused by Wolfram's relative who wants Wolfram to take over.
Yuuri travels around trying to help stop the war, as usual trying to be the hero. At some point he is even unable to return home. ~~Mystery~~
All these problems are caused mainly by one person and for a good reason, in order to obtain the...not spoiling it.
There is still quite an amount of humour based in the show and there are different arcs even though it is only a 39 episode anime. Yuuri's brother is alot more involved which makes it more enjoyable, especially the last episode were i almost pissed myself. It was sooooooooo funny. You may just think i am weird but i enjoyed this anime and i recommend it to you if you enjoyed the first series.
P.S. The OVA is crap so don't judge this anime from that.
Story: 8/10
Art: 8/10
Sound: 7/10
Character: 8/10
Enjoyment: 8/10
Overall: 8/10