This is an era of infinite possibility—of steam and steel, gears and springs.
Steam engines and difference engines symbolize the boundless future of human civilization.
And yet, no one has noticed: beneath the smog of steam and in the shadows of steel, those dark and mysterious forces… have never truly disappeared.

In this turbulent, free, and dreamlike world, a traveler from another land will unveil the veil of secrets lurking in the dark—
and write his own story, his own legend...