In the far future, human beings have already advanced outside the solar system, enjoying prosperity. Six stars have been cultivated so far, and many people migrated.
Then, we reach the seventh planet Earth "Seventhia".
The enthusiasm for people to explore the new planets has already disappeared from people, and several companies and few immigrants moved to Seventhia in search of scarce resources.
The time has passed and the light of prosperity starts to appear in Seventh Tier.
This story is the story of the settlers about the planet Seventhier.