If ヘタリア had an OFFICIAL crossover with any アニメ あなた wanted, what アニメ would あなた choose?

SAO. The game had a world wide release and all the countries were trapped in the game with their people. Also it'd be interesting to see modern versions of the characters, I think most/all of ヘタリア takes place over years 30 ago, but the world's changed quite a bit recently.

I kind of want to say Nichijou because oh my gosh that would be hysterical XD

ouran high school host club!!!! that would be awesome!!!!

Katekyo Hitman Reborn ! I would 愛 to see how the countries react to the Vongola family along with the rest of the Italian Mafia .

I think Black Butler would be interesting. I'd 愛 to see Ciel and Sebastian's reactions to America.

EDIT: Attack on Titan would be super cool. I'd like to see which brigades the countries would choose to join, and their reactions to the Titans.

Hard choice, although it would be slightly interesting if it was crossed over with naruto, well it would also be kind of sad, because there would be alot of deaths. :/

Katekyo Hitman Reborn is my first choice when I first think about it.
秒 is Kuroko no Basuke.

Pokemon!!! Corny, I know but, gosh I 愛 Pokemon and ヘタリア crossovers so much! My most favourite childhood アニメ crossed over with my most favourite アニメ would just put a huge smile on my face! I would 愛 it so much! <3

Boku no Pic--
Not an アニメ (although there's a manga), but I would 愛 to see the countries meet Kingdom Heart's Organization XIII

Pokemon!
Maybe Sonic the hedgehog even though it isn't an anime! (Not counting Sonic X)
But I can see it happening!