A mecha otaku gets a second life and immediately treats magic like code. The show's smart enough to let him actually solve problems by importing real knowledge instead of just wishing hard. You get cool robot designs, snappy pacing that never wastes a scene, and the satisfaction of watching someone competent actually be competent without the typical isekai padding.

Ernesti gets a second chance at life when he's reborn in a world where towering mecha called Silhouette Knights are real. After dying in a car accident, a Japanese mecha otaku wakes up in the Fremmevilla Kingdom as the child of a noble family, carrying his old memories, his old passions and a remarkable gift for magic. He enrolls at Royal Laihaila Academy, a school that trains young people to pilot Silhouette Knights and defend the kingdom from demonic beasts and human enemies alike. Alongside the twins Adeltrud and Archid, Ernesti sets out to build a Silhouette Knight of his own, something nobody has managed in centuries. The result is a fantasy mecha action story about a reincarnated fan chasing his dream machine.