Soul Universe

One day you are having a normal life and then, you suddenly fall into a pit of darkness which makes you teleport to a hall with a 1 door and nothing else. You go into that door, and you meet the current grim reaper who says you have been kicked outside reality and that if you want to be brought back to the living, you must pass all of his tasks you are also given a scythe to complete all of your tasks and then you will become the new grim reaper and also you were chosen for it