Just as Shin Uchiha was about to speak to Naruto, he sensed something unusual happening inside his body.
At the same time, the system he had all but forgotten spoke in his mind:
Ding! Host has collected the chakra of all Nine Tailed Beasts and met the requirements to upgrade the Rinnegan to the Tomoe Rinnegan. Would you like to proceed?
Shin Uchiha frowned slightly. No longer able to spare time to talk to Naruto, he placed a hand on the boy's shoulder and took him to the top of Hokage Rock.
"Naruto, I have something to take care of, so we'll have to leave our chat for another time."
Naruto was briefly taken aback by Shin Uchiha's words, then quickly nodded and said:
"Uncle Shin, if you've got something to do, go ahead. You've already brought me back to the village, so you don't need to worry about my safety."
Hearing Naruto's reply, Shin Uchiha gave his shoulder two gentle pats, offered him a smile, and vanished.
Takamagahara Space.
At the highest point of the island.
After returning to his space, Shin Uchiha sat cross-legged there and focused all his attention on what was happening inside his body.
When his consciousness returned to his mental space, he found nine clusters of Tailed Beast Chakra before him, each resembling a flame of a different color.
At the same time, the system's voice sounded again.
Host has collected the chakra of all Nine Tailed Beasts and met the requirements to upgrade the Rinnegan to the Tomoe Rinnegan. Would you like to proceed?
This time, however, Shin Uchiha did not immediately agree. After a moment's consideration, he asked:
"System, how long will it take to upgrade my Rinnegan to the Tomoe Rinnegan?"
The system answered Shin Uchiha's question