There's trouble in Sundans. The PgPiano, which gave life and protection to the masses, has had its sheet music stolen. Its creator, Kal Starton, turned up dead, his red journal nowhere to be found. Could the evil corporation Xata - Ongoing Against Zero be responsible? Amnari Arai, a wandering spirit, is determined to find out.
Together with three inexperienced cadets from rebel group SKyfALL - Luna, Keiichi, and Kitomi - Amnari sets out on a quest to recover the lost pieces of sheet music and Kal Starton's journal. Along the way, the three cadets discover that there are many more secrets in Sundans than they knew. These secrets shake their relationships with each other, those they meet on their journey, and Amnari, changing Sundans forever.
Together with three inexperienced cadets from rebel group SKyfALL - Luna, Keiichi, and Kitomi - Amnari sets out on a quest to recover the lost pieces of sheet music and Kal Starton's journal. Along the way, the three cadets discover that there are many more secrets in Sundans than they knew. These secrets shake their relationships with each other, those they meet on their journey, and Amnari, changing Sundans forever.