After seven years of grueling training, Son Ken finally earns his martial arts license — only to walk straight into the collapse of civilization. When a mysterious outbreak turns Japan's cities into hunting grounds for the infected, Ken and a handful of survivors must find shelter in an abandoned facility deep in the Okutama forest. But safety is an illusion. As the infected evolve into something far more dangerous, Ken and his friends face impossible choices — between survival, loyalty, and the people they used to be. A gripping horror-survival saga that asks: what's left of humanity when the world stops being human?