Mount Myoboku, a place of inheritance as renowned as Ryūchi Cave and Shikkotsu Forest, existed in a separate dimension, cut off from the Shinobi World. The only ways to travel between the two worlds were through the Summoning Technique or Space-Time Ninjutsu.
After entrusting the affairs of the Hokage to Minato and Nara Shikaku, Uzumaki Kuming brought his two students, Uchiha Itachi and Shisui Uchiha, here. As Kuming put it, it was only reasonable for a Hokage like him to take a few months off to recuperate...
He had come to Mount Myoboku for a particular reason. His first priority was to solve the problem that suddenly appeared whenever he used Senjutsu. With the two Toad Sages, Fukasaku and Shima, watching over him, Kuming could investigate the issue.
His second goal was to properly teach his two prodigious students.
If he could simply set Uchiha Itachi and Shisui Uchiha on the right path, it would greatly help Kuming's plans.
"Gurgle, gurgle..."
Beside the Sage Spring on Mount Myoboku, Kuming sat cross-legged by the water, his eyes closed as he gathered Senjutsu Chakra. Sage Fukasaku stood on his shoulder, holding a Black Receiver and watching for any changes.
"Pop..."
Suddenly, a soft sound came from Kuming. His sleeve burst as his arm underwent a transformation, revealing green skin.
Smack! The Black Receiver slammed hard into Kuming's back, knocking the Natural Energy out of him and swiftly ending the transformation. Kuming slowly opened his eyes, a trace of confusion in them. He had tried many times, but whenever he gathered Senjutsu Chakra, Natural Energy would rush uncontrollably into his body.
In an instant, the balance between Natural Energy and his own Chakra would be disrupted, throwing Kuming into a toad transformation. Many days had passed, but he still hadn't found a solution.