"Knight's & Magic" is a manga series that blends elements of mecha, fantasy, and isekai genres. The story centers on Tsubasa Kurata, a Japanese programmer and mecha enthusiast who dies in a car accident and is reincarnated into a fantasy world where magic and giant humanoid robots, known as Silhouette Knights, exist. Reborn as Ernesti Echevalier, a young noble with a prodigious talent for magic, the protagonist retains his memories and passion for mecha from his previous life.

In this new world, magic is a fundamental force, and Silhouette Knights are powered by magical energy. Ernesti, driven by his obsession with robots, quickly becomes determined to pilot and design these machines. Despite his young age, his advanced knowledge of programming and engineering, combined with his exceptional magical abilities, allows him to innovate and revolutionize the technology behind Silhouette Knights. He joins the Royal Laihaila Academy, a prestigious institution where students train to become knights and pilots, and forms close bonds with his classmates, including the skilled twins Adeltraud and Archid Olter.

As Ernesti progresses through his studies, he uncovers the limitations of existing Silhouette Knight designs and begins developing his own models, pushing the boundaries of what is possible with magic and machinery. His creations attract attention from both allies and adversaries, leading to conflicts with rival nations and powerful organizations. The narrative explores themes of technological advancement, camaraderie, and the challenges of adapting knowledge from one world to another.

The series features a mix of action, strategic battles, and character-driven moments, with Ernesti's ingenuity and determination serving as the driving force behind the plot. Supporting characters, such as the Olter twins and other academy students, contribute to the story's depth, showcasing their growth and struggles as they navigate the demands of their roles as knights and pilots. The world-building incorporates a blend of medieval fantasy aesthetics and futuristic mecha elements, creating a unique setting that distinguishes "Knight's & Magic" within its genre.