In a parallel-world France, the Hundred Years' War rages on.
Jeanne, who has yet to become the Saint, is still just a village girl when, one day, she finds an unconscious boy from the Divine Land.
"I don't want to become a 'hidden strategist,' and I don't want to be Lord of Martial Peace. I just want to stay quietly by Jeanne's side. Unfortunately, this chaotic era is forcing me to take up the sword, step by step. How can a world like this be changed?"
Having lost his name and some of his memories, the boy is well versed in the teachings of the Marquis of Wu. From then on, he sets off down the road to working himself to death...
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