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2XXX A.D.

The remarkable progress in science and technology has realized terraforming (modification that makes a planet habitable), and earthlings are now able to emigrate to another planet.

The government on Earth has proactively promoted emigration and interplanetary immigration as a solution to the serious problems on Earth due to overpopulation and the associated scarcity of resources.

Colonies were built as interplanetary transit bases, and for the security of the Shuttle, the immigration ship traveling among the planets, the international space defense organization known as S2 was established.

Over a century has passed since the beginning of immigration...