When Ling Ye, a social beast from the real world, was thrown into the Holy Grail battlefield in Fuyuki City by a red light that tore apart dimensions, he concluded a soul contract with the legendary King of Britain, Artoria Pendragon, that even the Holy Grail could not explain.
She has no magic circuit, but she can nourish the glory of the Holy Sword with her flesh and blood; she doesn't understand the rules of the Holy Grail, but she has to protect her from the fight of the seven Servants.
From the first resonance in the abandoned church, to fighting side by side under the Wind King's barrier; from the fight on a rainy night in Fuyuki City, to the echoes of the past in Britain's homeland - the "Star Factor" in Ling Ye's body gradually awakens, which can not only strengthen Saber's Noble Phantasm, but also cross dimensions and borrow the power of other worlds.
"You are not my Master, but you are someone I am willing to risk my honor to protect." When Artoria's emerald green eyes reflected Ling Ye's figure, this unexpected bond would eventually rewrite the outcome of the Holy Grail War, and even influence the fate of the entire dimension.
This is the story of an ordinary person traveling through the heavens with the King of Knights, growing up in the light of swords and shadows, and staying together in the resonance of souls - witnessing the immortal legend of a stranger and the King of Britain in the place where stardust fell.
