Bleach: The new Gotei-13 law

The war between the Shinigami and the Quincy is over.
The Shinigami have won.
But many powerful Shinigami died in this battle.
The Soul Society has been weakened.
And to strengthen the Soul Society, a new law has been proclaimed!
The weak must obey the strong!
Now, to become the new Commander-in-Chief of the Gotei 13, you must participate in a tournament.
If you win, the loser must obey you.
But if you lose, you yourself will be obeyed...
After all, only strong Shinigami can protect the Soul Society!
Thus begins a new chapter in the life of the temporary Shinigami Ichigo Kurosaki...