Saikyou F Rank Boukensha no Kimama na Henkyou Seikatsu?

Situated on the extreme frontier of a dreaded magical borderland, the city of Lumen serves as a rugged outpost teeming with dangerous monsters. It is the kind of unforgiving environment where only the most hardened veterans dare to tread, making survival a daily struggle for anyone lacking experience. Yet, it is here that Roy arrives entirely on a whim, presenting himself to the local guild as nothing more than a newly registered F-ranked adventurer. To the seasoned locals, a novice wandering into such a perilous territory seems destined for a harsh and likely brief existence. However, the unassuming facade Roy maintains conceals an extraordinary reality. Far from being a helpless beginner, he possesses top-tier mastery in both swordsmanship and magic, placing him leagues above the standard adventurers who call Lumen home. His true capabilities vastly exceed his official rank, turning what should be a desperate fight for survival into a remarkably casual life on the frontier. The sudden emergence of this overwhelmingly powerful "novice" quickly disrupts the established order of the remote city. As Roy effortlessly handles threats that would normally require elite forces, his presence begins to send shockwaves far beyond the borderlands. What starts as a quiet arrival in a forgotten outpost soon spirals into widespread havoc, forever altering the world around him.