THE SKY IS BURNING. With Rat critically injured protecting him, Shion finally returns to NO. 6. But what he finds there is not the tranquil utopia he left behind, but a city in the grip of panic and chaos. As the "holy city" collapses in on itself, Shion and Rat put will the future of humanity - and their future together - on the line in the shocking final volume of NO. 6! Story Locale- No. 6 Series Overview- When Shion, a privileged boy, gives shelter to an urchin for the night, the city he once called home forces him into the ghettos for insubordination. Four years later, an epidemic breaks out across the city.

Shion, along with the help of the urchin Rat, must clear his name, even if it means exposing the ugly truth behind the perfect city No. 6.