Saw all of it and the ending of the series was nice.
Ending of the series spoilers, you have been warned if you did not finish watching it
[spoiler]They did not go with the harem rout and Henrieta is left alone to get over Saito. Wow at how one of the queens had the mirror to have an affair, and she fallowed it by coincidence. The ending left me wanting to know about Saito's parents, they never show the parents when they need to, wanted to see the expression they make, and if Saito gets a beet down XD. Well I did not like the pace of this one, it was much more slower then even the 3rd season. I also forgot if Saito ever returned the ring, will have to re-watch later on[/spoiler]