Rise of Demon King Volume 1

By the stroke of fate, Ren finds himself in a world of demons, Kalkan kingdom.
Damned by his circumstances and his human-like appearance, Ren struggles to survive in a world in which strong rule the weak.
The Selection of the next king of the Kalkan kingdom is about to begin, bringing along many conflicts that make life much harder to endure, but unwilling to give up, Ren is determined to survive and prosper.
Only the strongest and mightiest will rise to the top, who shall rise to the challenge of claiming the vacant throne of the Demon King?