At Tenryuji Temple in Kyoto, a vicious battle royale begins, gathering warriors to fight to the death along the Tokaido. Amid the bloodshed, Shujiro Saga, a man desperate for money, rescues a young girl, Futaba Katsuki, from the chaos. Having just faced the monster Gentosai alongside his foster siblings at Senninzuka, Shujiro calls in old favors to allies in the Home Ministry to get to the bottom of this deadly game. But as more monsters make themselves known, the shocking truth of this battle royale, and those responsible for it, is revealed…