Synopsis: "Sabitsuita Ken" wo Tameshi ni Kyoukashite Mitara, Tondemonai Maken ni Bakemashita

In this realm, upon reaching the age of twelve, a divine gift in the form of a sacred weapon is bestowed upon you by God. Rust, a resident of an isolated village, harbors aspirations of being an adventurer along with his childhood companion, Ruby. While Ruby is granted the A-rank holy sword, Rust receives a battered, F-graded rusty sword. Despite facing rejection from a top-tier party, Rust refuses to abandon his dreams and perseveres with his rusty sword. With gradual progress, he vanquishes weaker monsters and fortifies the rusty sword. After three years, the "Rusty Sword" progresses to level 10, and a newfound ability is awakened, upgrading it to an unyielding magical sword. The tale follows the journey of a young boy, who was considered the weakest, as he embarks on a quest filled with unprecedented adventures.