In the aftermath of the devastating Second Great Kanto Earthquake that reshaped Tokyo into MegaTokyo, the city thrives on the labor of mechanical beings called 'Boomers.' Originally designed for benevolent purposes, these Boomers are now manufactured by the enigmatic Genom corporation as powerful weapons that can masquerade as humans. With the rise of Boomer-related crimes, the newly formed AD Police struggles to contain the escalating threat, outmatched by the overwhelming strength of these artificial foes. Amidst this chaos, a group of clandestine heroes emerges - the Knight Sabers. Clad in advanced powersuits surpassing even military technology, these four extraordinary women, led by Sylia Stingray, Priscilla 'Priss' Asagiri, Nene Romanova, and Linna Yamazaki, stand as the last line of defense for the city's populace, combating rogue Boomers with skill and grace.