"When I Tried Strengthening 【Rusted Sword】, It Evolved into an Overpowered Magic Sword" is a Japanese light novel series written by Takaraku and illustrated by Takuya Fujima. The story follows the protagonist who attempts to strengthen a seemingly weak rusted sword, which unexpectedly evolves into an incredibly powerful magic sword. The light novel series began publication online, and later was officially published in physical form. It has also been adapted into manga and anime formats. If you're asking about details such as release dates or where to find the series, or more about the plot, feel free to ask!
