The Immortal Dungeon Master: A Lowly Adventurer Betrayed and Abandoned Vows to Make His Former Female Party Members Understand and Take Revenge!

A women-only A-rank adventurer party called "Deep Emerald," possessing both beauty and skill. Garen, who aspired to be an adventurer but has no magical power at all and is called "Mabuke" (magicless), lives as a bottom-tier adventurer. To repay the debt of his deceased best friend, he ends up working as a general handyman and frontliner for "Deep Emerald." However, both his best friend's death and the massive debt were all orchestrated. Learning the truth, Garen is abandoned in a dungeon, falls to the deepest level, and nearly loses his life—but while on the verge of death, he unexpectedly inherits the power of the lord of monsters and becomes the ruler of the labyrinth, a [Dungeon Master]――.

Source: Bunkasha, translated