Itachi Uchiha was already dead. He died at the hands of his younger brother as he wished, but an illusory and ethereal voice sounded in his ears, and he fell down before he could hear it clearly.
When the removal of the dirt and rebirth completely dissipated, the voice sounded again, and this time he heard it clearly.
Go to another world, go to another world
He lived in a burden all his life. He killed his entire clan with his own hands. People who knew about it praised his greatness, but he could not forgive himself.
Maybe death is a complete relief. After leaving the last concern in this world, even if there is no chance to start over, let's live happily again.
In another world, once again create the legend of Uchiha Itachi