This is a parallel Earth where alchemy exists and powerful women known as Divine Maidens are real. It is the early twentieth century, and the world is on the brink of the First World War!
Our protagonist is an irreverent pervert who transmigrates into this world and becomes a master spy skilled in disguise, a man of a thousand faces! From then on, he leads an exciting life, occasionally teasing Divine Maidens and playing both sides among alchemists, politicians, soldiers, and spies. Disguises, forgery, wiretapping, turning agents, assassination, spying on Divine Maidens: he'll do whatever it takes.
Even... cross-dressing.
"I'd rather die here today than... Ah, it's all for the mission... Huh, a skirt is perfect for hiding things!"
In short, this is an exciting and entertaining story set against the backdrop of the First World War!
P.S. The protagonist is not a cross-dresser! On the contrary, he has a very interesting personality (chaotic alignment)! Please keep reading!
P.P.S. Some parts get rather serious. After all, this is a world war.
P.P.P.S. There are some battles of wits.
P.P.P.P.S. This book is also known as The Thousand-Faced Spy Is Going to Turn the Whole World Upside Down! (Aren't there a few too many P.S.'s?)