While snapping pictures of his favorite subject -- the sky -- budding photographer Yorito meets a mysterious girl who abruptly vanishes when the sun rises. Turns out, she's actually a &NFi;Yaka&NFi_;, an immortal being that cannot endure sunlight. And though she does possess terrific supernatural powers, it's her friendship with Yorito that will prove to be the best protection against the murderous man who's pursuing her.