Born to Haunt

Ethan Jackson's father rules the ten courts of the underworld, his mother is a corpse king a thousand years old, and his older sister collects souls as a reaper. Ethan is the heir to all of that. By accident he ends up as the human sent to represent Drakenhold in a horror game where countries compete against each other, and Drakenhold has always been near the bottom of the table. Ethan tests at F-tier talent. The other players expect him to be killed in his first instance. The boss of that instance suddenly drops to its knees and calls him young master. Every boss in the ghost world is a relative of his. Ethan takes charge of a team and puts it up against players from other countries and against S-rank monsters. He uses monsters out of old myths to hold a safe zone, and Drakenhold gets back some of the standing it used to have. Then the game moves into a new phase and the fight over resources and survival starts over.