When I Tried Strengthening a Rusty Sword, It Turned into an OP Magic Sword

【さびついた剣】を試しに強化してみたら、とんでもない魔剣に化けました · "Sabitsuita Ken" wo Tameshi ni Kyoukashite Mitara, Tondemonai Maken ni Bakemashita · 【녹슨 검】을 시험 삼아 강화해보니, 터무니없는 마검으로 변했습니다

Updated June 2026

When I Tried Strengthening a Rusty Sword, It Turned into an OP Magic Sword is an ongoing Action, Adaptation, Adventure manga (2021). Read it online free on XOmanga.

In this world, when you turn twelve, God gives you a special weapon called a sacred weapon. Rust, a boy living in a remote village, dreams of becoming an adventurer with his childhood friend Ruby. Ruby receives the highest rank, A, but Rust receives a battered, F-ranked rusty sword. Unlike his childhood friend who was recruited by a top-ranked party, Rust was told that his dream of becoming an adventurer would never come true, but he didn’t give up and decided to fight with his rusty sword. He defeats weak monster little by little and steadily strengthens his rusty sword. Eventually, after three years, the Rusty Sword finally reached weapon level 10. At that time, a skill awakened in the rusty sword, and it evolved into an overpowered magical sword.