Knight's & Magic

Japanese programmer and mecha otaku Tsubasa Kurata dies in our world and gets reincarnated into a medieval fantasy kingdom — except this world has giant robots called Silhouette Knights, which is basically his dream come true. Reborn as Ernesti Echevarria, a noble kid with ridiculous magical talent, he's not just content to pilot these mechs. He wants to build them from scratch. The 13-episode TV series follows Eru as he enrolls in Royal Laihiala Academy alongside his friends Addy and Kid, learning to fight demonic beasts while quietly revolutionizing how Silhouette Knights are designed and engineered. What makes this one stand out in the isekai pile is that Eru's real weapon isn't overwhelming power — it's his programming brain from his past life applied to mech engineering. He's basically a medieval Tony Stark who geeks out every time he sees a robot. The tone stays youthful and fun throughout, more focused on the joy of creation and problem-solving than grimdark stakes. Studio 8bit delivers solid mecha action that actually feels weighty when it needs to. If you liked the overpowered-but-earned genius vibe of The Irregular at Magic High School, or the strategic military flavor of Alderamin on the Sky, this scratches a similar itch but with way more robots. It's also got that Overlord energy of someone from our world genuinely thriving in another one, minus the villain angle. A good pick if you want fantasy isekai that does something different with the formula.