Raid is a demon beast hunter who lives in the southern continent. He was backstabbed by a comrade in a beast subjugation mission and was left alone to die. He was swallowed by a beast, but due to pure luck, he survived. After this incident, he gained the special ability to see the weak parts of beasts. This enabled him to have an advantage over beasts that no one else in the world has. With his newfound power, he sets out to kill all the demon beasts, AND get revenge on his former comrade. In a world where there is no magic or any special powers, Raid is a 'special' human. His adventures teaches him more about his powers, the cruel nature of the humans, the mysteries of the world and the truths and secrets about beasts.