In 2027 MegaTokyo, just six years before the Knight Sabers debut, artificial humans known as boomers are still a new technology. Their integration into society is often buggy, sometimes fatal, prompting the creation of the Advanced Police, an elite force tasked with handling boomer‑related crimes. Rookie officer Leon McNichol begins his career in the AD Police, working alongside veteran partner Gina Marceau. Together, they confront the daily horrors and tragedies of MegaTokyo, gradually discovering how the boundary between man and machine continues to blur.