Matthias von Rauschenbach, one of the heroes of the Kingdom of Greifturm, the oldest kingdom on the continent of Enderant, is a reincarnated individual.

Due to his extraordinary intellect and foresight, said to be akin to precognition, he comes to be known as "Matthias the Wise Strategist" or "Matthias of the Clairvoyant Eye."

Against the invasions of the Zoldat Empire, the continent's strongest military nation, and the fanatical religious state of the Recht Holy Nation, he faces both tangible and intangible obstructions from an indecisive king and great nobles who are "traitors within." Despite this, he works to modernize the anachronistic royal army, orchestrates stratagems against enemy nations, and averts critical situations.

However, a genius of military and politics emerges in his archenemy, the Empire, and formidable foes such as the mysterious assassin group "Nacht" (Night) and the sorcerer collective "Seekers of Truth," who stop at nothing to achieve their goals, appear one after another.

Even amidst these deadly struggles against his enemies, he was also called "The Smiling Strategist," for he would offer his plans with a relaxed smile, an expression that seemed to convey absolute confidence.

However, Matthias was merely an ordinary person with memories from Japan. While his information analysis and presentation skills surpassed those of people in this world, his knowledge of military affairs was only at a level gleaned from novels and movies.

Furthermore, he was born with a weak body and carried the handicap of possessing no talent for martial arts or magic. Moreover, technological innovations utilizing knowledge gained from Japan were sealed away as dangerous technologies that could collapse the world.

His trademark "smile" was merely a wry smile in response to desperate stratagems.

To protect his beloved family and comrades, Matthias resolves to fight formidable enemies by cooperating with his talented friends, while also borrowing the power of a great sage and their subordinate group of highly skilled spies.

He emphasizes the importance of information more than anyone else, cunningly uses information for stratagems to confuse enemies, and further contributes to victory by employing unexpected tactics on the battlefield...

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As the synopsis states, the protagonist possesses only incomplete knowledge gained from Japan, with no cheat-like exceptional abilities. The story is primarily intended to be a serious narrative focusing on political schemes, stratagems, and military tactics, with minimal romantic elements and, of course, no harem elements.

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Also published on Kakuyomu, AlphaPolis, and Novel Up+.

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Volume 1 was released on September 10, 2025. Thank you for your support.