A woman named Eliza wakes up transformed into a low-ranking summoned beast—a chicken—in a beast-taming world. Despite her status as an S-rank genius, her bound beast is mocked as a disgrace, and she initially refuses to bond with the seemingly useless creature. However, the chicken reveals it carries an ancient phoenix bloodline with an activated Devour Evolution System and even shows an SSS-rank potential. The system urges Eliza to bond with the beast to avoid backlash and accelerate growth. After initial resistance, Eliza reluctantly agrees to form the bond, setting up a crucial turning point in their shared destiny.