After the American Army shot down a UFO in 1947, generations of elite commandos were secretly trained to deal with the aliens' feared return. However, the extra-terrestrials never came back and the elite force was disbanded. Sixty-six years after the Roswell crash, the aliens are invading Earth and only the over-the-hill retired commandos can stop them.。人类曾在遥远的过去与怪兽战斗。如今是宿有怪兽之魂的少女们在地球上诞生的时代。成为GIRLS成员的阿基拉、米克拉斯、乌英达姆稳步成长,每天过着充实的生活。然而有一天,新品种的“影子”引起了麻烦。另一方面,GIRLS的新成员“嘎次星人”感到了身体不可思议的变化。。