This is an era of infinite possibilities, steam and steel, gears and clockwork. Steam power and differential engines symbolize the infinite future of human civilization. However, no one noticed that under the haze of steam and in the shadow of steel, the dark, mysterious mystery has never left. And a traveler from a foreign land will unveil the mysterious veil in this turbulent, free and dreamy world, and write his own history and legend

Under the daily routine, at the end of rationality, outside the world you are familiar with - it is a landscape you have never imagined.

When Yu Sheng opened the door for the first time, the world he was familiar with collapsed.

And the "truth" that goes straight to the root of the world came to him.