Centuries ago, Kanna, a princess and the last of a winged race, was imprisoned in a castle because the world feared her. When she met a soldier named Ryuuya, she fell in love and told him of her wish to see the outside world and to find her mother. Ryuuya tried to help her, but his efforts failed: Kanna was sealed in the sky by magic and cursed to suffer pain for all eternity. Hundreds of years later, Yukito, a descendant of Ryuuya, arrives in a quiet town a week before its annual festival in hopes of making some money. When he meets an unusual girl named Misuzu, he is reminded of what his mother once told him, “When you go…”