It's been over ten years since gates that lead to another dimension have begun appearing across the world. The battles between the magic beasts inhabiting the dungeons through the gates and the human hunters who have awakened the abilities to fight them show no signs of ending. Ordinarily, a hunter's abilities do not change upon awakening, with their rank never increasing. However, the low-ranked Sung Jinwoo, known as "The Weakest Hunter of All Mankind," gained the ability to level up through battle during a raid on a double dungeon.

Having completed a job-change quest that earned him the job "Shadow Monarch" and command over an army of shadows, Jinwoo heads into battle seeking the ingredients for the Elixir of Life to save his sick mother.

[Source: Crunchyroll]