Soul Domain.
After Hagoromo Otsutsuki left Hamura Otsutsuki's office,
he took Gol D. Roger, Wu, and Kagami Uchiha with him.
They boarded an Underworld Ship and sailed out through the Shinobi World Pure Land's Styx estuary.
Then, following the guidance of the "soul coordinates,"
they crossed a vast Underworld sea completely shrouded in dense fog, where even the waves were black as ink.
The voyage lasted less than two days by Material Domain standards.
Roger stood by the railing in silence, watching the waves of Underworld water below.
All kinds of phantom souls would occasionally emerge from those pitch-black tides.
Some looked savage, some peaceful, while others wailed in agony.
For an ordinary person without sufficient willpower, even one glance might have caused nightmares for days.
But to Roger, they were merely a peculiar sight.
His mood was heavy.
At first, he had wanted to refuse the Sage of Six Paths' invitation.
But the other man's words—would he spend his entire life hiding from the World Government and never see his wife and child again?—had made him unable to persist.
Now that Rayleigh, Gaban, and the others were all gone, the only people he still cared about were Rouge and Ace.
Originally, he had thought that since he was already dead, he might as well enter reincarnation.
But now, the World Government's war of conquest against other worlds was not limited to the mortal realm. It also extended to the Underworld.
If he "left," what if Rouge and Ace suffered some mishap in this Underworld after they died?
He absolutely did not want them to end up with their souls scattered and destroyed.
So he decided to stay, remain by the Sage of Six Paths' side, and protect this last Pure Land for his wife and son.
When the time