In a world where the system awakens special powers within chosen individuals, four-year-old Gru manifests as an S-rank Hunter during her time at New Spring Kindergarten's infant class. But awakening comes with a catch—a mysterious quest tied to her newfound abilities. Orphaned and parentless, Gru faces an unexpected path to strength: finding guardians. When South Korea's mightiest Hunter adopts her after a series of fateful encounters, everything changes. Fresh skills unlock with each guardian she bonds with. The revelation hits like a thunderbolt—gathering S-rank guardians accelerates her growth exponentially. With determination burning bright, Gru sets her sights on assembling the strongest guardian squad possible. What begins as a quest for family becomes an adventure to unite the most formidable hunters in existence, all while navigating the chaos of being a hero before kindergarten ends.