In a world wher humans and beastmen exist there lived a human named Axel Devore and he was also known as Phage the vilgilante. Phage was an alien Known as a klyntar that bonded with axel when he was 14. He is now 19 and leaving for a city known as animacity where a girl named Michuru Kagemori meets Phage as he is taking down a mugger. How will these two end up as friends or enemies. Shirou Ogami is investigating the uprising of the Klyntar kind and his investigation leads to a company called the Life foundation And meets the Big creature himself riot.