Three girls walk into Tokyo's dead zone with no suits, no masks, no fear. The show never explains why until it shatters everything you thought about them. Coppelion drops you into a premise that feels like it's lying to you, then methodically proves you were never asking the right questions about what survival actually costs.
Twenty years after Tokyo's nuclear catastrophe, the city sits frozen in radioactive decay. No one enters. No one survives. Then a distress signal cuts through the silence, and the Self Defence Force sends in their most unlikely team: three teenage girls from Coppelion, a classified unit engineered with radiation immunity built into their very genetics. Aiko, Ibara, and Taeko move through the poisoned streets without protective suits, without fear, searching for whoever sent that signal. But their mission uncovers darker truths. Why were they really created? What happened to the survivors they're supposed to find? And how long can they keep their existence secret when powerful forces want them contained or destroyed? The girls navigate a desolate Tokyo that belongs to no one, caught between their manufactured purpose and their emerging humanity. They're weapons designed to function in humanity's most toxic spaces, yet each rescue attempt, each connection with a survivor, pulls them further from the sterile mission briefings that define their existence.