In the year 2015, during the final era where magic still possessed a formidable sway over events, the world found itself in a delicate balance between mysticism and scientific progress. It was within this intricate tapestry of forces that the Humanity Survival and Security Organisation, known as Chaldea, emerged. Chaldea's primary objective was to meticulously observe the ethereal realm governed by magic and the tangible realm governed by science, all while striving to avert the looming threat of humanity's ultimate demise.
Thanks to the unwavering dedication of numerous diligent researchers and scholars, the trajectory of human existence has been safeguarded, casting a protective veil over the forthcoming century of history. However, the tranquilly that had accompanied this foresight was abruptly shattered when the future landscape, meticulously monitored by Chaldea, unexpectedly disintegrated into oblivion.
The root cause can be traced back to the enigmatic Japanese city of Fuyuki, where an inconceivable anomaly took root in 2004. Within the confines of this enigmatic city lay a mysterious "unobservable realm," a phenomenon previously unheard of. Faced with this existential threat, Chaldea swiftly issued an imperative known as the Grand Order—an ambitious call to arms that beckoned forth a Holy Grail Expedition. This critical mission sought to delve deep into the heart of the singularity responsible for the looming extinction of humanity, with the audacious goal of unravelling its secrets and, if necessary, eradicating the peril that imperilled the very fabric of human existence.
The Demon God Belzebub, now masquerading as Leff Lynor, slyly infiltrated the sacred grounds of Chaldea, seamlessly blending in as a mage under the esteemed service of Marisbury Animusphare, the illustrious founder of The Organisation Chaldea. This prestigious group was renowned for its pioneering work in the realm of pseudo-servants, wherein human clones were imbued with the noble spirits of heroic beings.
Belzebub, driven by a dark and cunning purpose, sought to wreak havoc within Chaldea by ruthlessly eliminating all potential servant candidates for the experimental project in a cataclysmic explosion that reverberated through the halls of the mystical headquarters. With a cold determination, he orchestrated this treacherous act from within the very heart of the organisation before vanishing into the shadows, a malevolent whisper in the wind.
Amidst the chaos and destruction caused by Belzebub's sinister machinations, Ritsuka Fujimaru emerged as an unlikely survivor, his spirit unbroken and his will unbowed. Standing amidst the ashes of the fallen, Ritsuka found an unexpected ally in the form of the pseudo-servant known as Mash Kyrielight. Their destinies were intertwined in a pact that transcended time and space. Together, master and servant forged an unbreakable bond, a beacon of hope amidst the encroaching darkness that threatened to consume Chaldea.
Romani Archaman, the brilliant mind overseeing Chaldea's operations, alongside the masterful inventor and strategist Leonardo DaVinci, who had recently assumed leadership of the organisation, jointly assumed control of the critical situation. It was the advanced artificial intelligence system of Chaldea that first identified the emergence of a new singularity, a threat to the very fabric of human existence. Understanding the grave peril that loomed, Chaldea, in a decisive move, made the decision to dispatch its final master along with a loyal band of servants to the exact era where the singularity had manifested. This desperate mission was essential to safeguarding humanity from the catastrophic consequences that the disruptive singularity threatened to bring.
Thus, Fujimaru and Mash, prepared themselves for a perilous journey back in time to ancient Mesopotamia, specifically the tumultuous period of 2600 B.C. Often referred to as the Age of Gods, this era was shrouded in mysticism and ancient powers, making it a treacherous setting for any modern visitor. Their objective was to locate and retrieve a corrupted Holy Grail that had been manipulated by nefarious forces to create and sustain the sinister singularity. This Holy Grail, originally intended as a source of purity and divine power, had been twisted by the dark ambitions of the King of the Demon Gods, Goetia, who sought to alter the course of history by orchestrating the downfall of humanity itself. It was within this volatile landscape of gods and demons that Fujimaru and Mash emboldened themselves, their resolve unwavering against the impending chaos that threatened to consume all of existence.
As they both meticulously prepared for their imminent departure, Romani skillfully operated their supercomputer, utilising its immense power to successfully transport them through time and space, landing them right in the heart of ancient Mesopotamia. Upon their arrival in this ancient land filled with wonders and mysteries, a sudden disruption occurred in the communication link between Romani and Fujimaru, plunging them into a brief moment of uncertainty and vulnerability. It was precisely at this critical juncture that their surroundings became fraught with danger, as a horde of ferocious demon beasts descended upon them, ready to unleash havoc and destruction. Just as the tension in the air reached its peak and the impending battle seemed inevitable, a shimmering figure materialised out of the sky, exuding an aura of otherworldly power and grace.
This mysterious entity revealed herself to be none other than the illustrious goddess of the heavens, Ishtar, radiating an unmistakable air of authority and divine presence. In a single swift gesture, she unleashed her divine wrath upon the malevolence demon beasts, swiftly vanquishing them with a display of unmatched power and majesty. Without uttering a single word, the enigmatic goddess swiftly departed, leaving Mash and Fujimaru in awe of her remarkable prowess and unyielding protection. The lingering echoes of this encounter resonated within their minds, planting the seeds of curiosity within them.
A moment later, as tension hung heavy in the air, the group found themselves facing yet another horde of demon beasts that loomed ominously in front of them, their eyes filled with malice and hunger. The creatures seemed poised to attack, their gnarled claws twitching with anticipation, when suddenly a mysterious figure cloaked in shadows appeared from the periphery. With an air of calm authority, he stepped forward and unleashed a powerful burst of energy that obliterated the beasts in a blaze of light and smoke. As the dust settled, the figure revealed himself as Enkidu, his voice steady and resonant as he spoke. He explained that he had been aware of their impending arrival, having long anticipated their presence due to an ancient prophecy that had foretold of their coming. It was a moment of fate converging with destiny, as the group realised they were not alone in their quest and that powerful forces were at play beyond their understanding.