Glitched Hunter

Left to die at the bottom of a collapsing dungeon, you awaken with a mysterious System that breaks all the rules.
You were just a weak E-Rank Hunter. You risked your life entering dangerous dungeons to pay for your sick sister Yana's hospital bills. But everything changes when a higher ranked Hunter betrays you. He takes your reward, destroys everything you worked for, and leaves you behind to die. With your life fading away and monsters closing in, your desperate will to survive awakens something impossible: The System.