From the publisher:

In this, Yuichi Yokoyama's long-awaited original graphic novel, published simultaneously in Japan and France, a stripped-back plot and minimal characterizations allow the artistry of Yokoyama's ethereal drawings to shine through. The events within the narrative are spare and enigmatic: Yokoyama is as much fascinated by shapes and visual effects as he is by character and plot. First, the protagonists visit a city; then, our heroes watch airplanes departing and arriving at an airport; next, they go on board a ship and cross a river. Eventually, they arrive at a building where a man welcomes and guides them to the "world map room," where they inspect a library. Eventually they leave, and reach a pond with a sunken ship. Their guide starts to explain the ship's history, and slowly, with casual suddenness, the novel comes to a close.