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

By MIZUKI MANNO, YAEICHI, SHUNYA HASEGAWA, Iroto Tsumugi, Kori Hisakawa, Airumu Published by Manga Up!

When everyone turns 12 years old, they are granted a Mystic Arms by God. The hero-admiring Rust dreams that he'll get a powerful one of his own one day. As his fellow villagers began receiving high rank Mystic Arms one after another, Rust nervously prayed to God. Then, before him appeared a Mystic Arms of the lowest rank, a Rusty Sword. A tale of becoming "zeros to heroes" with the weakest boy and the lowliest weapon!