Chicago

In the midst of the 21st century, Tokyo's expansion has led to the rapid filling of Tokyo Bay with landfill, creating a burgeoning urban area. However, this growth is abruptly halted by a devastating earthquake, causing the liquefied landfill to wreak havoc on the newly constructed district. The Self-Defense Force Rescue Squad Four is dispatched to provide aid, but their efforts are met with a shocking discovery: a trail of murder and destruction that claims nearly the entire squad, leaving only Rei and her partner, Uozumi, alive. As the city struggles to cope with the aftermath, Rei and Uozumi find themselves drawn to the south-Shinjuku bar, Chicago, where they can find the support and resources necessary to uncover the truth behind their squad's demise. However, their investigation is soon complicated by a series of mysterious events: the discovery of dead bodies with bullet wounds, a hail of gunfire raining down from the air, and the revelation that their squad is listed as "collateral damage" with their records wiped clean. With their lives hanging in the balance, Rei and Uozumi must navigate the treacherous landscape to unravel the sinister forces at play.