High school senior Chu Sheng wakes up to find himself turned into a mosquito, binding with the Infinite Evolution System where he grows stronger just by drinking blood. By accident, he signs a blood pact with the reborn beast-taming empress Gu Yuexi, binding the destinies of one human and one mosquito together. From an Asian tiger mosquito to a molten blood mosquito, Chu Sheng evolves the abilities to control insect swarms and release pale flames, accompanying the empress in hunting beasts and seizing treasures, fighting against the Jingzhe Guild, and stirring up a storm in the Spirit Martial World. The mosquito counterattacks, contracts the empress, and opens the path of ultimate evolution!