In a world ravaged by a viral apocalypse, fifteen-year-old Ethan Mercer lives for one purpose: to protect his brother, Leo. Born from GeneCorp’s failed experiments to defeat death, Leo is a one-year-old whose body ages at a terrifying speed. Unlike the savage Accelerates, children transformed into predators by the virus, Leo clings to a fragile thread of humanity.

Together with Mia and Clara, two survivors altered by the same catastrophe, Ethan crosses a landscape of ruins and relentless danger. As they struggle to stay alive, Ethan faces the devastating truth that Leo, the last hope of redemption, may also be the instrument of humanity’s final collapse.

In a final act of sacrifice, Leo confronts his inevitable fate, altering the course of history in ways no one foresaw.

Years later, survivors gather in Leoland, a sanctuary where sunflowers grow in the rubble and memories remain alive. There, hope endures beyond all loss, proving that even in devastation, love can take root again.