The End of the World: I Have an Imperial Flag to Stock up on and Kill Enemies

[Female strong stocking upgrade + 1vn + male cleanliness] A strange red mist swept across Blue Star. The end is coming! On the way to escape, Xia Xi was betrayed by her boyfriend's family and became an abandoned son fighting against zombies. The pain penetrated into his bones, and Xia Xi's hatred was overwhelming. When it was about to mutate, the necklace left by its parents burst into dazzling light, and a purple flag suddenly appeared. The weapon spirit shouted: "The spirit of our imperial flag has finally reappeared in the world!" Xia Xi thought of the introduction to the Human Emperor Banner in the online novel, and her heart sank. Could it be that instead of being bitten to death by zombies, she had her soul absorbed by the monster and died? The weapon spirit said: "I will not harm you. Sign a contract with me and you can practice, have space, and find your blood relatives." Xia Xi, whose parents mysteriously disappeared when she was fifteen: "Sign!" Since then, the apocalypse has become her home field. When you encounter supplies, enter the Imperial Banner! When you encounter zombies, enter the Imperial Banner! Are you so curious when you meet someone who covets her treasure? You go too! As she upgraded step by step, men would appear next to her from time to time, begging for her mercy. They were young puppies, senior parents, and genius researchers with ruthless surfaces... Well, you can help me solve my needs. When she reached the top of the world, the mastermind finally arrived. The world is in despair again! Xia Xi stood up holding the flag: "It's time for the Human Emperor flag to be used for your true purpose. After all... You are the most precious treasure of the human race!" "Yes, my lord!"