As the apocalypse descends and plants and animals mutate, Su Yu, a girl with no supernatural abilities, becomes bound to the "Infinite Pet Power-Up System." Forced to venture into the outside world with Sheriff, her black-and-white cat, and Chocolate, her Beagle, she discovers that Sheriff can control minds while Chocolate can eat absolutely anything. Along the way, she recruits the Flower-Crowned Spider, the sound-mimicking bird Sheng Shengyin, and Rongrong, the hamster leader. After arriving at the Panshi Base, she exposes an insider who stole food and framed others, eventually becoming the city's ruler. Zhao Beichen, the Lord of Blazing Flame City, tries to provoke her but ends up humiliated and is transformed into a red rat by a mysterious doctor's potion. When Blackwing Moths launch a nighttime attack, causing residents to mutate, Su Yu investigates their origin and uncovers the truth behind the apocalypse: Doctor Jiang Yongyan engineered this human-made disaster through genetic experiments to prove that technology is superior to emotion.