Hangyakusha to Shite Oukoku de Shokei Sareta Kakure Saikyou Kishi

Aldia, the most formidable knight in the Kingdom of Leshfeld, was the driving force behind the conclusion of a devastating war against the Vulcan Empire. Hailed as a hero for his unparalleled contributions, he was ultimately betrayed by his own kingdom and executed on fabricated charges of treason. Yet, his deepest regret was not his unjust death, but his failure to protect Princess Valtrune of the Vulcan Empire. Despite standing on opposite sides of a brutal conflict, she had shown him mercy and saved his life when he was on the brink of death—a debt of gratitude he could never repay. When Aldia opens his eyes once more, he discovers that he has been sent back in time, awakening in a world six years before the catastrophic war ever began. Armed with the knowledge of the future and driven by an unshakable resolve, he vows to rewrite history. Abandoning the kingdom that condemned him, Aldia chooses a new path: pledging his sword and absolute loyalty directly to Princess Valtrune as a knight of the Vulcan Empire. In this second chance at life, he will use his overwhelming strength to shield her from the tragic fate that awaits, defying destiny itself to change the course of the world.