The End Times, the Girl, and the Sword of Protection

Through an invitation from another world, a girl named Kinodera Alice entered a kingdom straight out of a fairy tale. But before she arrived, the fairy-tale kingdom had already become a wasteland... So how will the girl survive in this desolate world? (I just made this up. It's not actually in the book.)

This story has only old-fashioned Japanese-style names and a slightly serious post-apocalyptic wasteland setting. If that's not your thing, move along.