I'm Keeping Vigil for the Border Town, and You Say My Sister Is a Demon?

Good news! Bai Yujing and the entire human race in the five cities are about to ascend! Bad news! The people in the border town were left behind and were driven away by monsters. In the border town of Futu City, young Lin Zhou just wants to save enough money for medicine to survive with his nine-year-old sister Lin Xiaoli. But after a night of visions, white frost entered the alley, and dragon shadows pressed over the city. The white jade capital in the sky was still high, but the world was already in turmoil. When the night fell towards the border town, he carried his sister and the remaining lights of the city on his back, becoming the night watchman of the border town. "You said my sister is a demon? Fart! She is an immortal who is going to Bai Yujing!"