So I finished Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai just now and yeah I guess it could be considered sad if you get REALLY attached to the 11 episode anime but they sort of threw in some obvious loopholes at the end to sort of justify a reason to end the anime off...I think at least?
I dunno but if you guys like drama animes then that is a good one to watch if you have time to kill.
Also the intro to the anime has got to be one of the more calming intros I have ever heard:
http://www.youtube.com/watch?v=UyE9cLpt0oM
Sadly I could not get the shorter version so here is the full song.