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Under the shadow of Angel City, high school student Yu Meng woke up from the cold dissection table of the research institute. Her memory was fragmented, leaving only the name "Yu Meng" and her hands full of blood. He found that he had become a product of the "Human Weapons Project", possessing powers beyond ordinary people and strange genes of the vampire family, but he had lost all anchors to the past and emotions. There are turbulent undercurrents in this world: the "Sky Sword", the plutocratic army that controls everything, the ancient "vampires" who are thirsty for blood and eternal life, and the mysterious organizations "Shenqi" and "Ghost Slayer" who quietly appear with unknown purposes. Various forces compete in the ruins and neon lights of the city, and Yumeng's awakening is like a stone thrown into stagnant water, causing unpredictable ripples. Holding the black-red demonic sword "Fire Slash" and accompanied by the girl Shiori whose life experience is a mystery, Yu Meng embarks on a cruel road of revenge and memory. He wants to uncover the truth about "Operation Midnight", find his missing mother, and recover his blood debt from the "Sky Sword" and "Blood Clan" who dragged him into the abyss. However, as the memory fragments gradually come together, an even more astonishing fact emerges - his existence is actually closely related to a catastrophe that swept the world thousands of years ago, and to the ancient king known as the "Demon Lord." When the king of darkness whispers again, and when the road to redemption is full of thorns, Yu Meng must make a choice between destruction and protection, sinking and awakening. This is a fateful showdown that spans thousands of years, and it is also a redemption legend of finding the glimmer of humanity in the abyss of despair.

As the systems of various countries separated and collapsed one after another, a monopoly power composed of a multinational group took advantage of the situation and used its strong financial resources to control a private military force. Their claws spread all over the world, and the entire planet was shrouded in a dark shadow. They control energy, enslave the weak, and mutilate innocent civilians. They erode the law of death and build their own mask of hypocrisy with chaos and conspiracy. They dominate the new order of this world, and they call themselves "Sky Sword"