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Strange and bizarre murders frequently occur in a bustling metropolis. A huge black hand hides behind the scenes and controls everything. A detective with legendary experience was ordered to form a team in the face of danger, leading his teammates to trace the truth of the case and restore the story behind it.

A centenarian learned the secret of the origin of mankind after his death. He was tasked with a special mission and lived again with his memories. While he continued to strengthen himself, he made up for the regrets of his previous life. History gradually changed with his appearance. In his childhood, he was a super prodigy in literature, martial arts and medicine. When he was a boy, he was a bug among athletes and a trendsetter in the entertainment industry. In his youth, he was a sharp sword in the army and the leader of the underground world. In his middle age, he integrated resources, devoted himself to maintaining the continuation of human civilization, and established the Guardian Alliance to eliminate all threats that destroyed civilization. "Everyone who has been reborn has awesome skills and awesome systems." Kizaki said: "I can learn it if I don't have any skills! It won't waste much time. I don't need the system, but I can equip one for my subordinates."