Ten years ago, "the Gate" appeared and connected the real world with the realm of magic and monsters. To combat these vile beasts, ordinary people received superhuman powers and became known as "Hunters." You were just a regular D-Rank Hunter until... a miracle happened. Two out of eight billion people have been chosen by the system to level up and grow. (Only you and the other chosen one can level up.) Hence, your story begins. A D-Rank Gate just opened!? No one is here to help!