A mystery novel about Shun Okamoto, a young man who drifts into Naha's waterborne shopping district over the Garb River and is drawn into a case involving a drowned body, U.S. military shadows, the CIA, and legends of the Ryukyu kings. Against the atmosphere of postwar Okinawa, it also follows a bereaved young man searching for a place to belong.

In a floating shopping district born from postwar disorder, a corpse, a legend, and the shadow of espionage begin to connect.