Fate/Stellar Peccatum

In an era where Humans and Extraterrestrials (known as "Celestials") coexist in a hollow utopian harmony, civilization is built upon Mythic Science a fusion of ancient human magecraft and alien quantum technology. At the heart of this utopia lie the Sacred Machines, gargantuan reactors that sustain life, eradicate disease, and maintain galactic peace. However, this peace is a profound deception. Fitran Fate, a human professional assassin specializing in high-profile alien targets, accidentally hacks into one of the Sacred Machines during a mission. Beneath the machine’s divine luminescence, Fitran uncovers a grim reality: the reactors are fueled by human souls whose memories have been systematically erased. The "peace rituals" glorified by society are merely a mass harvesting system for the Celestials. Encountering this raw truth triggers Fitran’s sealed memories and awakens an ancient Holy Grail system dormant within the machine. Responding to Fitran’s burning hatred and indomitable will, this energy anomaly summons seven incarnations of original sin beings once feared by the entire cosmos. Manifesting as seven formidable women of the Caster class, they stand ready to shred the false reality constructed by the extraterrestrial overlords. The fabric of a society built on Mythic Science is finally beginning to unravel.