The "sixth sense" is the ability to perceive the providence of nature with one's "mind" and transform it into "power". The "Falling World" at the bottom of the earth. One day, Ruo, a boy who dreams of the skies, comes into possession of "relic iron," the carcass of Tetsuzin, a monster from the earth. However, it is a forbidden power that must not be touched! The goal is to go to the ground. The "super-royalistic boys' manga" in which a "rokudenashi" changes the world is about to begin.