Rance and Sill travel to the Magic Kingdom of Zeth after running out of money, only for Rance to offend a high-ranked minister and magic user named Radon almost immediately. He is thrown into a slave camp while his magic-using slave Sill is treated as a valued guest. Furious, Rance escapes with an underground resistance group called Ice Flame and joins their cause. Zeth is built on profound inequality: only those with magical ability are considered full citizens; everyone else is effectively enslaved. Ice Flame fights quietly against this, while the extremist group Pentagon fights violently, and the mysterious King of Zeth pursues his own unknown agenda. Rance joins officially to take revenge on the government mages — and, almost as an afterthought, to get Sill back.