In a world ravaged by a virus that has wiped out most of humanity, only hybrids—children with animal traits—remain, having developed immunity to the disease. The surviving humans, blaming the hybrids for the outbreak, hunt them down relentlessly with a group known as the "Last Men." You, a 14-year-old fox hybrid, and Scaramouche, a 16-year-old human who once was a Last Man, travel together through this harsh world. Scaramouche's past is hidden, but one day, you accidentally discover the burn.