Haibane Renmei - S01

Born from a cocoon in the village of Old Home, a young Haibane, a being with a halo and small gray wings, wakes into a world she does not understand, with no memories of her past. Named Rakka after the dream of falling she had inside the cocoon, she soon grows used to life in the strange town. But there are strict rules for the Haibane, such as being forbidden to leave the village or go near the walls that surround it. These rules, along with the mysterious disappearances of their kind on their "Day of Flight," begin to unsettle Rakka and the others, since they know almost nothing about their own kind. As Rakka and the other Haibane live their lives with no memories of the past, they try to break free from their former pain and ultimately find salvation.