High school junior student Emiya Shirou is twice an orphan. Once, a great fire that destroyed more than a hundred homes took the lives of his biological parents. He was then adopted by the man who saved him from that inferno, a man who called himself a magus; however, after a few years, that man, too, died. Shirou was left with a home, the dream to become a superhero, and some extremely limited knowledge of magecraft, the art practised in secret by magi all over the world. Now, unbeknownst to him, the city he lives in, Fuyuki City, is to become the place where a great war will be fought in secret by magi like the man who adopted him.