The nations of Oris and Gondnea are at war with each other. Oris’s oppressive military force wants nothing more than to track down something called Skanda – a secret safely kept with the unknowing Mio, a little girl with a hyper-sensitivity to sound. One day, Mio witnesses a Gondean helicopter crash and meets one of its passengers, Rico; but Rico’s memory only lasts for three minutes at a time, and she doesn’t remember what she’s doing in Oris. Together, the two must stay one step ahead of the forces of Oris if they are to stay alive…