From Viz:
In the mid 21st century, the Self-Defense Force Rescue Squad Four look for survivors in the rubble of a massive earthquake. Instead, they find a plot of murder and destruction, one that wipes out all the squad except tomboy Rei and Uozumi, her cool, handsome partner. After several brushes with death and a daring prison escape, the two race toward their destiny at the shady Shinjuku bar known as Chicago.