When a young girl, Rekka, wakes up from a dream, she finds a ring of light over her head and she is welcomed by a group of girls who had wings on them.
Rekka then becomes a member of the Haibane Alliance, the group who protects the town of Guri, enclosed by walls.
Why did Rekka become a Haibane? Who were the Haibane? As Rekka continues her life in the peaceful town of Guri, the mystery behind her new friends begin to be revealed.
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