A gorgeously illustrated dystopian thriller from Shonen Jump +! In a desolate prison city, a young woman's search for her long-lost brother begins. A prison the size of a city. A lonesome, snowy place that houses all manner of criminals. It's within this cage that an orphan named Chloe struggles to survive while caring for her baby brother. But when her neighbor hatches a plan to bust them out, the wheels of her fate begin to turn. This is the story of one girl's battle to hold onto hope.