Finn, labeled an F-tier and repeatedly insulted by the privileged Zink family, faces harsh humiliation and the threat of having his sister forced into servitude at a breeding camp. Despite scoring highest in the Spirit Power test, Finn is stripped of his citizenship and told he will become a slave. Defiant, Finn refuses to accept this fate. Suddenly, a system notification announces that the rare Nine-Tailed Fox, one of the Ten Ancient Demon Beasts, has been detected and bonded to Finn through the Divine Evolution System, granting him a chance to infinitely evolve his Spritkin. This unexpected turn sets the stage for Finn's fight against his imposed destiny.