Summer Air : Season 1 Episode 8

This story takes place 1000 years before the Dream arc. Kanna is a girl with wings confined to a palace with a friend, Uraha, and body guard, Ryūya. When Kanna is to be sent to another temple, the 3 escape and go on a journey to find Kanna's mother. Meanwhile, the palace is attacked and the 3 are pursued. They finally find Kanna's mother but she tells them to leave.