UFO Warrior Dai Apolon was a Japanese anime series aired from 1976 in Japan. There were 47 episodes aired at 25 minutes each. It is also known as "UFO Senshi Dai Apolon", "UFO Soldier Dai Apolon", "UFO Robo Dai Apolon", "Dai Apolon", "Shadow World".

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.

Following the journey of a caterpillar along the Japanese islands from Nagasaki to Hokkaido, this allegorical and oblique first feature film by Kuroki depicts in exquisite images a series of encounters and life's turning points.