The sea was foggy in the early morning in Eternal Peace River Prefecture. What happened next, the guards stationed at that time wouldn't be able to forget even after many years.
Grayish fog spread across the surface of the sea while a huge narwhal leaped out. Its body flew above them as though it was a cloud, covering the docks of River Prefecture.
The whale then became smaller and smaller as it fell into the city.
Before the soldiers could even come back to their senses, they saw another huge shadow sailing in from the fog on the sea. It was a tortoiseshell ship, with all kinds of shells crawling over its body. A black tortoise flag fluttered in the sea breeze.
The huge ship sailed straight toward the dock, and just as it looked like it was going to crash into the dock, it suddenly lifted dozens of yards off the ground with four legs. The ship then walked in the air above the ships and rumbled into the city.