Youjo Senki Light Novel

''On the front line of the war, there's a little girl. Blond hair, blue eyes and porcelain white skin, she commands the army with lisping voice. Her name is Tanya Degurechaff. But in reality, she is one of Japan's most elite salarymen, reborn as a little girl after angering a mysterious being X who calls himself "God." And this little girl, who prioritize over anything else efficiency and her own career, will become the most dangerous being amongst the sorcerers of the imperial army...''

The Youjo Senki Light Novel is a light novel series written by Carlo Zen, illustrated by Shinobu Shinotsuki and published by Enterbrain.

Meaning of the titles
So far, except of volume 4, the meaning of each title is related to the last paragraph of the volume. Here listed their meanings.