In 2033, a huge earthquake leveled much of Tokyo. Now it is 2040, and Tokyo is a gleaming futuristic metropolis. Boomers are still in widespread use, working at tasks ranging from construction to waitressing. Humans have accepted Boomers into their daily lives, even though some still do not quite trust them.
Many Boomers have an almost human appearance, which some humans find unsettling.
Perhaps their dislike of Boomers is for good reason. As the years have passes, more and more cases of Boomers going wild have been reported. Boomers have been resisting their programming and running rampant on the streets, causing mass destruction. To combat this threat, Genom helped create the AD Police, a special branch of police that would take care of the wild Boomers. However the AD Police are not as effective as they could be, and to help fight the Boomers, a group of four women in technologically advanced battle suits have appeared, working in competition with the AD Police.