Aldnoah.Zero Season 1 Vol. 4 (manga)
The year is AD 2014.
The Deucalion is heading for United Earth HQ when Princess Asseylum, the vehicle's activator, suffers cardiac arrest. With the Aldnoah drive suddenly shutting down, the ship crashes into a snowfield.
Meanwhile, Inaho Kaizuka mercilessly throws himself into battle, and Slaine Troyard is faced with a choice now that he knows Saazbaum's mind...
And at the end of this heightened war, the thoughts of these two are--?!