* Adapted from Alice Soft’s erotica game. Alien invaders invaded via wormholes in the late twenty-first century, launching a massive onslaught on humanity. They couldn’t fight back and had to accept their fate. At the time, an ultimate weapon capable of conjuring up objects from thin air was discovered in a vast cave beneath Japan, together with its young master Ryuusei, who was frozen. He was awoken by the indiscriminate extraterrestrial onslaught, and he led the humans to a resounding triumph. Ryuusei was appointed as the commander of the newly formed Defence Force of Earth, which was founded to combat against space invaders, a year later, when the places that had been destroyed by the aliens were still being rebuilt. The ‘imagination embodiment apparatus’ could only be used by him. If anything happened to him, the entire planet would be destroyed. As a result, the Earth Defense Force started to seek for young women who could fight alongside him. They all had their own motivations for joining Ryuusei, despite their initial reluctance. As a result, the ‘Blade Briders’ special force was created to guard the Earth against the returning aliens.