[No system] + [Power] + [Absolute logic] + [Single female protagonist]
I really don't know how to write an introduction, so I write the reason for opening the book.
A picture of one person... One sword... Facing an endless tide of corpses alone, guarding a city.
This is the reason why I started the book, and it is also the plot that I am most looking forward to and want to polish most.
I started by writing a tragic hero
But think about it... The protagonist's life was not very good, and he lost... Everything, that's a bit too cruel.
So I changed the outline so that it would be a good ending where the world is lost but "her" is protected.