Sekai Saikyou no Honoo Mahoutsukai

Without warning, an ordinary man finds himself reincarnated as Leonhardt, the overweight villainous noble from a video game he once played obsessively. Fully aware of the miserable fate that awaits this character in the original story, he firmly resolves to avoid such a doomed conclusion at all costs. His determination extends especially to Celia, his favorite heroine from the game—a tragically ill-fated beauty whose sorrowful destiny he vows to rewrite. As Leonhardt, he promises to love and protect her until the very end, ensuring they both reach a genuinely happy future together. To defy the cruel script written for him, he dedicates himself to rigorous training from early childhood. Blessed with the divine protection of Ifrit, the Great Fire Spirit, his relentless efforts yield extraordinary results. Both his magical prowess and swordsmanship grow far beyond their expected limits. Before long, his tireless dedication triggers an unforeseen evolution, awakening within him the power of the world's strongest fire user. Armed with unparalleled flames and an unbreakable resolve, the former villain begins forging a completely new path, determined to shield the woman he loves and shatter the tragic narrative once meant to destroy them both.