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

In this new world, magic is a fundamental force, and Silhouette Knights are piloted by knights to combat demonic beasts. Ernesti, driven by his obsession with mecha, quickly becomes determined to design and pilot his own Silhouette Knight. His innate talent for magic and engineering allows him to excel at the Royal Laihaila Academy, where he studies to become a knight runner, the term for Silhouette Knight pilots. Alongside his childhood friends, Adeltrud and Archid Olter, Ernesti forms a close-knit group that shares his ambitions.

The narrative progresses as Ernesti's innovations in Silhouette Knight design and his unconventional approach to magic revolutionize the field. He creates advanced models, such as the Telestale, which outperform traditional designs. His actions attract the attention of both allies and adversaries, leading to conflicts with rival nations and powerful demonic beasts. The series explores themes of technological advancement, teamwork, and the pursuit of personal passion, all set against the backdrop of a world where magic and machinery intertwine.

The main characters include Ernesti Echevalier, whose genius and determination drive the story; Adeltrud Olter, a skilled knight runner and Ernesti's loyal friend; and Archid Olter, Adeltrud's twin brother, who supports Ernesti's endeavors. Other key figures include Dietrich Cunitz, a fellow student and knight runner, and Helvi Olter, the twins' older sister and a seasoned knight. The series balances character development with action-packed battles, showcasing the evolution of both the characters and the Silhouette Knights they pilot.