Far away in space, on the fringes of a galaxy, a planet was destroyed by a great evil. At the same time, on Earth, violent crimes committed by the Knockers were occurring frequently, threatening humanity. At that time, our protagonist, Chu Atsushi, was attacked by the Knockers, but was saved by a mysterious humanoid robot that fell from the sky. This marked the beginning of a new hero legend by the heroes of two planets who should never have met. The Knockers, the destroyers and vicious criminals of Earth, are pursuing Cosmo X. The battle between Atsushi and Cosmo X will involve the entire universe!