The Greatest Beast Morpher in the apocalypse

In a world that teemed with mystical creatures, abominable monsters and Kaijus, Johnny, a slum rat, had never expected anything big in his life until he was among the few to get an invitation to join the Defense Corp—an eminent group of people armed to defend, protect and battle against the foreboding, terrifying abominable horrors from the world. But during his journey as one, he suddenly discovers a system within him that cages a long, ancient powerful beast that would change his story… or rather, the world's hope to a different course. -Don't forget to also follow up in webnovel!