Humanity is now composed of 5 colonies. Each has an armada of ships that travels through 5 exoplanets. These worlds, populated by intelligent life forms, involve a single choice dictated by survival: conquer. Decornum is vast and its abundant resources could allow the Japanese colony to lay the foundations of a new civilization... if only part of the aliens, whose heart is capable of generating almost unlimited energy, were not hostile to them. Out of breath, men and equipment, the colony is forced to retreat, leaving on the planet some burned heads like Keïto whose mission is to collect information vital to their survival.