Matsumoto Yuu, a thirty-four-year-old systems engineer and divorced cat lover, is abruptly transported to a fantasy world alongside his pet cat, Orihime. The two appear in the territory of the impoverished Viscount Klausfeld, where Yuu meets Annemarie, the young noblewoman struggling to manage her family’s failing lands. Rather than return to his own world, Yuu decides to use his programming knowledge and logical problem‑solving skills to rebuild Annemarie’s territory. He quickly discovers that this world operates on a system of magic that can be analyzed and systematized much like computer code. By applying his engineering mindset, Yuu begins deciphering ancient magical theory, setting up a laboratory, and developing innovative magical tools—effectively introducing a technological revolution. Meanwhile, Orihime, who remains a cat and retains her gentle personality, unexpectedly gains a powerful magical ability of her own, which becomes a crucial asset. The story follows Yuu as he applies his craft to everything from basic enchantments to large‑scale infrastructure projects, navigating political complications, visiting a magical workshop, and evaluating Orihime’s mysterious powers. Along the way, the bond between Yuu and Annemarie deepens, and the narrative balances lighthearted cat‑centric comedy with the methodical, step‑by‑step process of turning a rundown barony into a thriving territory. Key arcs include the deciphering of ancient magic bases, the preparation of a research laboratory, a visit to the fortified city of Klaufendam, and the gradual revelation of the true potential of Orihime’s power.