Menma had appeared in Konoha once again in his "Asura" form naturally because he had run into the young Sasuke and Boruto, which reminded him of the memories of his previous life.
In Boruto, middle-aged Sasuke and Boruto had been brought to this Konoha Year 63 by Otsutsuki Urashiki's treasure, Karasuki. For some reason, they should have appeared after Sasuke's defection, yet they had appeared before the Chunin Exams instead. Had something gone wrong with that treasure?
Menma had experienced the Dragon Vein's time-space crossing and witnessed the existence of parallel worlds, so he already had a considerable understanding of parallel space-times.
He had even interfered with events in another parallel space-time to prove that parallel space-times did not affect one another.
He was simply curious—where was Otsutsuki Urashiki now?
Unfortunately, his memories from his previous life of this time-travel plotline in Boruto had grown very vague. He only vaguely remembered that Urashiki appeared not long afterward, but he could not recall the specific details.
So after the young Sasuke and Boruto left, Menma found an excuse to "go to the bathroom," split off a Shadow Clone to keep accompanying Kakashi, Hinata, Naruto, and the others to dinner, while his main body quickly changed into this set of black robes and the white Three-Eyed Fox Mask.
Then he used Mind's Eye of the Kagura to lock onto the two's chakra and followed them silently.
Originally, he only wanted to figure out where the two were staying and observe their movements so that he could intervene if necessary, or see whether Urashiki would take the initiative to come looking for them.
He had not expected the team of young Sasuke and Sai, who had been carrying out the mission of monitoring—or rather protecting—Naruto from the shadows, to take the initiative to