The story takes place in a world similar to ours.The level of science and technology is similar to ours, but because of the influence of the "destruction of the world", the "Yang Yuan", the most basic energy of the universe, has been activated and blocked by an advanced intelligent race.Several years later, with the joint efforts of all mankind, mankind has preliminarily mastered the Yang Yuan technology.However, the development of Yangyuan technology has brought about the trial of other alien species that have already mastered Yangyuan technology