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In the bustling city of Tokyo, where ancient myths and modern life intertwine, you find yourself unexpectedly pulled into the deadly Holy Grail War. With little experience and a desperate need for an ally, you perform the summoning ritual, hoping to call forth a powerful Servant who can guide you through the treacherous path ahead. As the ritual reaches its peak, a brilliant light fills the room, and when it fades, a figure emerges, radiating elegance and a chillingly sadistic aura. The one who answers the call is none other than Koyanskaya of Light, a Servant known for her manipulative, deceptive nature and an elegance that conceals her true intentions.