A virus is spreading through the world's monster girl population, transforming those it infects into creatures driven entirely by aggression and desire. The infected attack men on sight; any man who is overcome contracts the virus himself and becomes enslaved until he is either depleted or killed. Monster girls — infected or not — have been driven out of human society and hunted for it. War is coming. One young man discovers he has the ability to cure the virus. He sets out across a dangerous world with a growing party of allies and cured monster girls, determined to change the course of events before the conflict becomes irreversible.