Sci-fi in the early stage, fantasy in the later stage. Female protagonist + reverse time travel + technological magic + easy direction + super new group-level ancient civilization + reasoning
A brilliant civilization suddenly disappeared, leaving behind an empty starry sky and its remnant soul.
What else is here?
In a naked primitive society, there is no need to worry about food and drink, and they can have fun all day long;
The sun never sets, but it's not tidally locked, and there's impossible magic;
Modern clothes but with a feudal political system are neither science fiction nor fantasy;
But that has nothing to do with me, all I want to do is get the details of that ancient civilization.
