At the end of the 21st century, humanity was fiercely attacked by aliens who appeared suddenly. People were powerless against them, and were ready to resign themselves to their imminent death, but at this time in one of the caves of Japan, was discovered a new weapon capable of creating elements with the help of imagination, and a young master Ryusei able to control it, who until then was in cryostasis. An alien invasion and their chaotic attacks awakened him, and he in turn led humanity to victory. A year later, the areas attacked by the aliens were restored, and Rusei was appointed commander of the newly formed Earth defense force created to fight the space invaders. Nevertheless, he was the only person who could use the imagination incarnation device. And if anything happened to him, the planet was doomed. As a result, the Earth Defense Force decided to recruit girls of potential to fight alongside him. Even hesitating at first, each of the girls still had their reasons for joining Rusei. And in the end all the same, a special squad, the Breeder's Blade, was formed to defend Earth from the aliens who had returned.