Come Again, Demon King

Where is my magic sword? Where is my Hell Thunder? After the Demon King Mort was killed by a hero, he was reincarnated as a miner and lost everything. What's even more outrageous is that a guy from the New Demon King has extended his black hands to Mort, who now has nothing. The new Demon King intends to absorb his life force to lift the seal of the Four Heavenly Kings and use it for himself. In order to regain his inheritance, Mort reluctantly turned his sword blade against the monsters. Just because he got a golden finger after rebirth---upgraded by killing monsters. But surprisingly, this golden finger is exclusive to the brave! This world is a game!