After a young boy captures a rare butterfly in Nagasaki, a caterpillar begins a relay-trip toward the northern tip of Hokkaido, serving as a silent witness to a series of vignettes featuring people struggling with the psychological and social scars of post-war Japan.

A trio of high school students, Ichiro, Hiroshi, and Reiko, try to give a demonstration against the suspension , but they are ignored by the students and embark on an unreliable journey.

On a beautiful island in Seto Inner Sea, Seichi and Minko make their living by transporting rocks to construction sites by boat. They cherish the deepest affection for this piece of land they call home, and the simple life they lead. But rapid industrial growth makes it all but impossible to continue their chosen living style, and they are forced to leave their beloved hometown in search of a brighter future. But their hometown lingers on their hearts, and they dream of a time when they may once again return.