Hello,
Let's explore a new manga/anime series that aired last year and got quite a nice number of followers due to his rather interesting story concept. (at least for a tv broadcasted anime)
It's name is KissXSis (got a 12 episodes TV adaptation and a couple of OVA) and it's a work from Bow Ditama.
Let's start with the always present synopsis :
The story centers on Keita, a third-year middle school boy studying for his high school entrance exams. His older two twin stepsisters Ako and Riko Suminoe - with no blood relation to him - help him prepare for the exams, but life gets too cozy between Keita and the girls.
Well this synopsis, while short, summaries very well the focus of the series that is comedy and fanservice. (no much romance here unfortunately for us)
This is a rather effective comedy based over the various misunderstanding and provocations made by the two sisters to Keita during his test preparation period (and likely will continue also after the test period 
)
The characters are funny and you'll end up loving each one of them, they do not have much growth through the series unfortunately as expected by a pure comedy series.
My favourite one is Riko (the younger twin) for her cute face and her blunt and explicit personality against anyone.
But let's not forget that there are other characters in the story that have some focus during the series and got quite a lot of blog talking. (Like Miharu and her antics)
The graphical department as you can see it's top notch for both characters and objects, the animation is also consistent through all the episodes with some minor screw up.
The opening and ending animation were quite funny, I loved the cg ending with the two sisters dancing on the tune of "Our steady boy" of YuiKaori!
The seiyuu in this series are not the most famous (except for the seiyuu of Azunyan), but nevertheless do a good job portraying the characters and their emotion.
I loved especially the Riko's seiyuu named Yuiko Tatsumi (the only other important role she got is as Ayame Satsuki in Seikon no Qwaser) and a bit Ako's one named Ayana Taketatsu (famous for her role of Azusa Nakano in K-ON)
Concluding this is a rather interesting and a suggested series if you're into comedies that shift heavily in the fanservice area while this is not a good series for someone new to anime due to massive amount of fanservice present everywhere.
That's all for today!
See you tomorrow,
feal87