When the earth was no longer suitable for survival, humans moved to the clouds and built a cloud city.
Colin was born in Cloud City, but his greatest wish is to return to the surface.
By chance, he and his sister Anna finally came to the surface and found that there were still humans living on the surface.
There, they also met a strange man, Dr. Feynman.
Together with Dr. Feynman, what kind of adventure stories will Colin and Anna experience on Earth? Can the abandoned earth be saved again?
Mission: Protect the earth, respect life
