When Mamoru runs away, his friends do what any good friends do - they try to find him. But on their search, they soon discover that they aren't the only ones tracking him.

Maria is gone; she has left Saki a letter explaining her decision. Saki is up against terrible odds - the disappearance of her friends, the fact that her memory may be erased again, and the monster rats might not be on the side of the gods after all!