Back to the Primitive World

[No System + no female lead + pure technology + not space opera + hard science fiction]

This is a novel about how humanity advances from an ordinary civilization to the next level of civilization, and the conflicts that arise along the way.

It all begins when a mysterious organization uses one of the protagonist's papers.

It will all end when humanity's struggle over civilization comes to an end.

This is a true work of hard science fiction.

The apocalypse is not the theme, but the backdrop to the direction of the times.