I just don't know how to get it to work in the storyline so I'm telling you beforehand what you have to know.
In another dimension to ours there is a world called libra. If you can read you made it to the upper echelons. And if you're knowledgeable about many thousand of books you were seen as a king. But there is one library that is the biggest of all. The librarian there is viewed as the god of the whole world.
Like most of the readers probably already suspected the MC in our story is exactly that librarian. Surprise!
As the god you have many advantages. Not just in having more books to read. Since this is another dimension, there is such a thing as longevity. The god, as long as he or she is the librarian and lives in this crazily big library he does not age.
Now to our MC. Firstly she is a woman... Well to be exact, she's a girl. After all her body is that of a young teenager, age of 14. The name she has in the other dimension is not relevant because the people there are calling her god and god only.
She is the librarian since about 10 millenia. As a comparison, the human civilization on earth only exists since a few thousand years. Now you would ask how it can be that she became a god with 14 years and how she could be the librarian there so long, right?
Under normal circumstances the librarian only lives there for a few hundred years and then the next one gets the job. This change comes through a game. This specific game was created together with this great library.
The rules:
1. Compare how many books you know by heart. The one with more gets to round two obviously.
2. Now your knowledge is tested by level. You can memorize, but can you apply it to multiple situations? This is a test with a holy paper that asks you for information about the books in the big library. The one with better points wins. 3. If you can now get an aptitude for relaxed, concentrated and persevering reading on a crystal specifically made for that by the one mysterious guy that created the library, you are considered to be the new god.
This game is played by two people the one and only god and the one who wants to be the new one. There is no restriction when you can challenge the god, so there is always someone who thinks he can win. After all this is the most popular job in the whole world. But most challengers already fail at the first test.
Our MC is the first challenger with a perfect score on the 2nd and 3rd round and since then no one could win against her.
After aeons of being the librarian there she got to know almost everything that could be known. Such as traveling through time and space. Or creating magical equipment for free, meaning without the need for ingredients. The same goes for alchemy and medicine or food. Well you get the point.
Now that she was practically omniscient she was bored. Extremely bored.
And like what you would think of after reading the title, she traveled to earth in the year 2019. Our time.