In a post-apocalyptic world torn apart by a nuclear war, the United States is now a battleground among six factions. Amidst this chaos, whispers of a utopian city called OZ, reminiscent of L.F. Baum's iconic tale, circulate. Determined scientist Felicia embarks on a perilous journey alongside the skilled mercenary Muto and the enigmatic android 1019 in pursuit of this elusive city. Their expedition culminates in a shocking revelation as they stumble upon a military stronghold and encounter a deranged individual. Meanwhile, a young girl enlists the services of a mercenary to guide her to the mythical Oz, believed to be a haven where her brother resides. Assisting them is a cyborg dispatched by her estranged sibling. However, what they find in Oz is far from idyllic, unraveling the facade of paradise and exposing the unsettling truth about her brother's fractured psyche.