Angelic Syndrome

On her 12th birthday, Angel becomes infected with a strange and deadly disease that causes feathers to sprout from her body. She is sent to an isolation facility, where she meets a man named Hakana. Together they must avoid the threat hanging over Angel, but who knows where their fate will lead them.

The isolation facility "Bird Cage" is a mysterious place like an urban legend, which is different from the world.
It was supposed to be a place that had nothing to do with the 12-year-old Angel, who had never been ill, but the snow-white feathers on the girl's arms robbed the girl of her freedom without any warning….