Ore no Turn wa Owaranai

Buildings all over the world have suddenly become monster-filled Dungeons. Every nation summons its full military might to fight this disaster, only to fail miserably. But when everything seems lost, the Awakeners appear! Armed with Gate Cards, the Awakeners destroy these dungeons and rise to fame and wealth. Wanting a better life for his family, Hanbit Park aspires to become an Awakener. But he'll soon realize that there are more than monsters out in the world... (Source: Tapas) Note: Chapter count includes a prologue.