Fallen Prince -from α to ω-

Marc, the Crown Prince of the Wald Kingdom might be a real hotshot in his own kingdom, but it wasn't too smart of him to bring a sword to a gunfight. After being captured over enemy lines, he's given an elixir that turns his comrades and himself from strong alpha warriors into soft omega bitches! As his body transforms and his pride as a man sheds away, "Maroon" will be a good little doggy and serve her new master!

Official English Translation