Chrono Crusade 

An truly amazing and unique manga by the amazingly talented, yet very perverted, creator Daisuke Moriyama.

Contrary to popular belief, it is not a shojo manga. (It doesn't even have that much romance.)
It has way more action and is far too in depth. It has some of the best art seen in manga in a LONG time.

Taking place in 1920's America it's about an exorcist named Rosette Christopher. She has contracted with a demon named Chrono to have her soul drained so he can use his powers and help her find her missing brother, Joshua. It is unlike any other manga out there. Really, read it.

The anime sucks. (and the dub is horrible, never watch it.)

person A: Did you read those Chrono Crusade volumes I let you borrow?

person B: Sorry, I was too busy watching Inu-Yasha.

person A: ...You're dead to me.

(yeah, Inu-Yasha is disgusting. Absolutely nothing compared to Chrono Crusade.)
--

person 1: Oh my god! What happened?

person 2: Oh, their head just exploded.

person 1: Why?

person 2: They read the last volume of Chrono Crusade. It was so amazing it made their head explode.

person 1: ah.

Chrono Crusade by CG. September 20, 2009

Chrno crusade 

A shoujo Manga and anime featuring nuns with guns. For the main characters it has a Headstrong, 16 year old nun called Rosette Christopher and a friendly Demon called Chrno who both work for the Magdalene order, an order devoted to slaying demons and demon summoners. It is like a baby version of hellsing, but still a decent piece of work. Spelled Chrno to avoid confusion with the games chrono trigger and chrono cross

Fangirl1: Squee! Chrno is sooo kawai!!

Fangirl2: From Chrno crusade, right? Man, it's cosplay is everywhere!

Chrno crusade by kawaikowai July 23, 2007