Shen Mo, a food delivery guy, accidentally travels to another world and becomes a cockroach spirit pet, binding himself to a devouring evolution system before being summoned by the Holy Maiden, Su Qianxue. At first, everyone mocks them, but Shen Mo grows stronger by devouring spirit beasts and helps Su Qianxue overcome humiliation. Together, they investigate and uncover an illicit industrial chain hidden within their sect, along with the evil deeds concealed by its upper ranks. Standing side by side, they fight off one challenger after another, while Su Qianxue gradually accepts the clever and loyal Shen Mo. During the sect's grand competition, the sect master attempts to silence them to cover up the crimes. Shen Mo completes his ultimate evolution, takes human form, and exposes all the crimes in front of everyone. He purges the sect of its treacherous members, helps Su Qianxue take control of the sect, and remains by her side to protect their home for years to come.