After years of upheaval, the world built a powerful power-generation System beyond Earth, one that covered the near reaches of space. The sons of the Federation’s five greatest clans had learned their families’ elemental powers from childhood. After entering the academy, they studied military theory, then ventured into the ruins of an ultra-ancient extraterrestrial civilization, where they obtained four fully assembled mechs and eleven non-Earth power engines. With their families’ support, they formed a powerful force of immortal troops...
Super beautiful, worth a look