The Kakure. More on them later.

↓ Transcript
Panel 1: Maida and her aunt are holding hands.
Panel 2: Maida, her aunt, mum, and brother stand on a crowded train station platform waiting as the train is finally in view. Maida's voice-over: "The Lowlanders accused the Highlands of being in league with religious extremists-- the Kakure."
Panel 3: Two Kakure fighter jets scream through the sky overhead. Voice-over: "But the Kakure weren't in league with anyone."
Panel 4: Maida has an expression of shock or horror on her face as they are illuminated by a bright light.
Panel 5: The train has been blown up in a storm of smoke and fire by the fighter jets as it approached the station.