In Ren's world, every newborn is branded with a countdown — the exact second they'll die. Ren's never took. When the timers call him an anomaly, armed hunters storm his classroom, and a white-haired girl with a baton drags him underground to the truth: the countdowns aren't fate, they're a harvest. At the heart of it ticks the Clockmaker, and the only weapon against him is a power called ZERO that costs a stranger's life every time Ren uses it.