You have died , suddenly , unexpectedly and unfortunately.
Of course , when a person dies such a sudden death , they have certain regrets about their lives , love , vengeance , sense of incompletion does not allow these souls to go to Heaven or Hell for reprocessing.
Therefore , the Netherworld was created , to host idle souls until they are ready to move on , an island on the river Sanzu (or Higan , your call) the Netherworld is a lively place.
The entire island is covered by the city of the dead , and in it reside ghosts. Each ghosts possesses power given to it by its regret . However ghosts cannot use such powers on their own.
However , a certain few ghosts have significantly higher powers , they are the chosen guardians of the Netherworld , the ghost royalties. In the center of the town of the dead lies the white tower of the ghosts , in it reside the 12 most powerful royalties , which together rule over the Netherworld.
As everyone is already dead , the most common way of settling disputes is killing each other , and the ghost royalties use this method to decide on the position of the top 12.
Royalties can offer ordinary ghosts multiple benefits. They can unlock their hidden powers and empower them , all they ask in return is their services during the stay in the Netherworld.
This has led to the current state of the Netherworld , ghost royalties hold most of the ghosts in "slavery" . And enjoy their "lives" to the fullest. Especially lately ,a very ambitious princess has begun gathering a sizable ghost army. What does she want with it is unknown , but probably something sinister.
After your death ,you awake at a seemingly deserted courtyard , all the doors are locked.And all you can hear is deafening silence and a distant sound of something that sounds like warfare.