Is the Beast Master an Armor, a Roommate, or the Strongest in the World?

When alien evil beasts lurk in the darkness of the world, only those who sign a contract with the beasts can protect mankind's last line of defense. "Who do you think you are? A superhero?" Chen Xuan pinched her fist and waved it towards him, "They have killed more superheroes than you have eaten! The world does not need heroes who can't even protect themselves!" "No, this world needs a hero, even if the hero is an idiot who can't even control his strength."