Above the clear skies, the Heart of Steel floated quietly.0

The towering fortress of steel was as stable as a floating mountain. Yet, inside the observation cabin hidden at the front of the airship, it was all hands on deck.0

"... An unidentified flying object observed at bearing 116 degrees approaching. Estimated distance, about 10 to 15 kilometers. It is observed with a vapor trail several meters long!"1

"Speed approaching Mach 1. It’s moving straight towards us!"0

"Our aiming system is severely out of focus. I can’t see clearly what that is. It seems like a missile!"0

"No radar response! They have anti-radar equipment!"0

For an object flying at Mach speeds, whether it’s 10 kilometers or 15 kilometers, it won’t take more than a minute to arrive0

The window for them to shoot was even shorter. They had  less than 20 seconds to take a shot!0

The soldiers in the observation cabin didn’t have time to be surprised. They immediately reported the situation to the weapon operators, and raised their emergency level to two.0

Although it was uncertain what that thing was, since it dared to challenge the authority of their Heart...0