It's an awesome anime. It's also at the top of my favorites list.
Like Clannad, it's a sin not to watch Spice and Wolf's second season.
Check out Spice and Wolf. Nao! :P
Hidan no Aria is similar to Zero no Tsukaima/Shakugan no Shana.
The themes/events/character introductions are getting too cliche.
Part1
Part2
Part3