Once Upon a Time in the Galaxy: Voices of the Twins

Humanity has discovered an extraterrestrial civilization that could solve the current energy crisis. In 2003, various radio telescopes on the earth received a letter from another world. From the "Scout Bee Series" launched in the past, humans discovered the huge energy contained in that world and the declining technology. The Earth's invasion of another world, the Twin Civilizations, has begun. (A total of three movies, "Once Upon a Time in the Galaxy: Voice of the Twins", "Once Upon a Time in the Galaxy 2: Star Ocean Expedition", "Once Upon a Time in the Galaxy 3: The Last Fire of the Night")