Interstellar Arithmetician

The thousand-year-old national master, after his death, traveled to the interstellar era and became a loser! The Imperial Master said that it was nothing, what should a loser be afraid of? After she refined a few furnaces of elixirs, even a loser would become a genius. But who will tell her that the plants in this era not only release poisonous fog but also bite people, and there are also a group of violent girls who can play with mechas as toys. The interstellar is really too dangerous, and she wants to return to Earth! PS: The title of this book has little to do with the content. It was chosen casually, so don't ask.