After leaving Minato's house, Shiro wandered aimlessly through the streets, the scene inside his Reality Marble flashing through his mind like a revolving lantern.
Although his research into the Reality Marble had given him some guesses about what lay within it, and he even understood its abilities to some extent, that battle against Madara had still been the first time he had used it.
That sight had not only brought Madara and the others an immense shock, it had also given Shiro a feeling unlike anything he had ever experienced. Homesickness once again filled his heart.
Fortunately, the plan was proceeding normally, and he was no longer lost.
He no longer needed to worry about what would happen to this world after he went back.
In truth, Shiro had long since found a way to return. Though the system that had brought him here was badly damaged and had already lost the ability to take him through worlds again, precisely because of that, it had given Shiro the chance to study it. Through his research, he discovered that the system actually still had a few functions that could barely operate, and among them was world traversal!
However, that function could only withstand one final traversal. In other words, it was a one-way ticket.
For a long time, Shiro had been tangled up over this question. Should he go back or not? If he went back, what would happen to his friends here? But not going back would not do either. A wanderer would always have a day when he returned home; fallen leaves, too, would eventually return to their roots.
Thankfully, Shiro had already found a way to have the best of both worlds. Only children made choices; adults wanted it all! (Even if they couldn't handle it!)
And honestly,