Saki fears the Ethics Committee is somehow altering the memories of her and her classmates. But when Mamoru has a breakdown, Saki is asked to quit looking for answers.

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!