A life as a god of death starting from Hueco Mundo

After his death, Xia Mu came to the afterlife.
When I opened my eyes, I saw a vast desert and a pale moon hanging in the sky.
Afterwards, another white monster attacked him.
Just when Xia Mu thought he was going to die, a figure dressed in black and holding a long knife appeared and dealt with the monster.
Everything is developing in a good direction.
Unexpectedly, a bigger monster appeared, and before he could ask the man who saved him his name, the man died.
In order to survive, Xia Mu could only pick up the long knife left by the man and choose to fight.
He didn't know that when he held the knife, he had become the god of death!
……
From Hueco Mundo to Soul Society, from the expeditionary force to the Gotei 13.
This is Xia Mu’s life as the god of death!
(Note: Hueco Mundo is just the starting point for birth. It will not last long and you will soon enter Soul Society.)
(Note 2: The protagonist has only watched the animation, so he only knows the plots that appeared in the animation and the plots of the original TV, and does not know the plots of the official novels)