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In 2123, the earth suffered a "sudden" large-scale disaster that spread all over the world. Many weak and small countries were quickly destroyed, and the world fell into darkness. The United Nations has decided to establish defense bases around the world and requires: Defense level is top in the world Possess physical weapons, biological and chemical weapons Master nuclear technology and state-of-the-art technology A 15-year-old girl (Siya Qi) stood up and determined to build a defense base. The base was named "Chewei Forest" and eventually became the strongest defense base in the world. At first no one thought highly of her, and only a few were willing to join. The business license was not passed after multiple reviews. By chance, he met the director of the military factory, gained support, and finally met all the requirements for establishing a base. After the 29th review, the business license of "Chewei Forest" was finally obtained. Siyaqi recruits two friends: Xilizi and Helixi. She was elected leader, and one night was chosen by the "ktzl" bracelet, giving her a new identity: "World Keeper." The main plot begins a year after she obtained the license.