In order to save Horizon, the newly elected Chancellor Tori must take his army through the Testament Union's best ground defenses. Meanwhile, the battle over the skies will be determined by a God of War and two witches in hiding. Who will reign supreme over ground and air, and will they get there in time to save Horizon?
The time for talking is over. Blades are unsheathed and ready to strike, as both sides decide that a quicker solution to the Horizon problem must be reached. As both the Testament Union and the Musashi representatives prepare for the worst, new information is revealed that can potentially change everything.
Don't come to a super powered knife fight without your Armor of Deadly Sins. As the platonic reactors begin hitting critical mass, one warrior stands tall to stop a madman bent on destroying all of Mikawa, while another equally skilled warrior stands in his way. Will he succeed, or will Mikawa burn away in the night?
The students make preparations for a party by Toori's request while Masazumi hears from her father about the tragedy that befell Horizon and Toori 10 years before. Meanwhile the Musashi is approached by ships from K.P.A. Italia and Trés España, two of the Harmonic Divine States with unknown intentions.
A brief history of the Harmonic Unification War is introduced, but hold that: Tori is having a "pre pop the question" get together with his class! How ill he confess his love to this mysterious girl? Meanwhile, Masazumi Honda contemplates the way her life has turned out thus far, and just what she can do to change it.