Finally on the third season this anime delivers!
Previously there was too much supposedly cross-border intrigue and warfare which was boring and ridiculous. When this show works best is when Saito leers at a chick and Louise appears behind him and kicks him in the balls, I can eat that up all day. And in this season not only is it mainly set at the school, with the threat of conflict with a magician remaining mainly in the background until the last few episodes, but the harem really fulfils it's potential. Previously the harem element was under-developed but now we have a new character with HUGE mammaries who loves Saito, the maid Seista is assigned to personally serve Saito, sleeps in Saito's bed and is open warfare with Louise, even Tabitha is getting on in the act! There's also new male characters’ forming the "Order of Perverts" who dig a hole and spy on the girls' baths in a scene reminiscent of Porky’s.
This is one hell of a side-splitting ecchi comedy and it's not even really necessary to have sat through the previous seasons so don't delay!