It is the middle of the 21st century and Tokyo is expanding more and more, filling Tokyo Bay with landfill to make room for the bursting population. But suddenly Tokyo suffers one of its greatest earthquakes, and the landfill liquefies, creating untold damage in the newly-made urban area. The members of Self-Defense Force Rescue Squad Four are sent to help. But what they dig up is a plot of murder and destruction--one that wipes out nearly the entire squad and leaves its two surviving members, the fierce Rei and her cool, handsome partner Uozumi, in a fight for their lives.