Haibane: Renmei Volume 3 - Free Bird

As winter approaches, Rakka is still confused and depressed over losing Kuu. Falling deeper into sadness, Rakka discovers the connection between her and the mysterious birds and seeks to touch the forbidden walls of the city. Unfortunately, she soon falls ill with a deadly fever. While nursing Rakka, a pensive Reki reflects upon her own troubled past and pays a visit to the Communicator, who warns her that she doesn't have much time left as a Haibane!