Haibane Renmei - New Feathers (Vol. 1) with Series Box

The Haibane, who look like angels with halos and small wings, share a walled town with humans. Both groups are forbidden to leave. Each of the haibane come to the town of Guri in a seed pod, that flies into the walled town and grows into a cocoon. They emerge at the same age of their previous life and their names are derived from the dream they had while 'growing' inside. Nemu and Reki have been there the longest, of the haibane, and Rakka is the new arrival. The pace, art, music, and story are very refreshing compared to your typical slapstick laden, fanservice filled anime. The less you know about the plot the more intriguing the story is.