Ōtsutsuki Isshiki had come to Earth a thousand years ago with Ōtsutsuki Kaguya as his partner to plant the God Tree. Not only had his status and strength surpassed Kaguya's, but he also possessed and controlled a second Ten-Tails.
Unfortunately, he had been somewhat unlucky. Caught off guard, Kaguya had used her inherited family craft—ripping out his heart—forcing him to reincarnate anew.
Members of the Otsutsuki clan were difficult to kill by ordinary means, so Kaguya had planned to sacrifice the gravely wounded Isshiki to the God Tree's Ten-Tails. Just as the Ten-Tails was about to devour him, Isshiki successfully activated his unique secret technique, Sukunahikona, shrinking his body and escaping the fate of being eaten.
Even so, the Ten-Tails had consumed most of the source of his power, leaving him on the verge of death.
But at that moment, he was fortunate enough to encounter a monk named Jigen. Isshiki activated Sukunahikona again, shrank his body, entered Jigen through his ear, and survived within him as a parasite while absorbing nutrients.
Once he had absorbed enough power to perform the resurrection technique, Isshiki implanted his own data into Jigen's body in the form of Karma, intending to use Jigen's body to complete his resurrection.
The so-called Karma was a method mastered by the Otsutsuki clan to convert their own information into data. As long as this item containing their data was implanted into another person's body, that Otsutsuki clansman could reincarnate through it.
However, not every monk possessed tremendous power. Though Jigen was also a practitioner, his body was not enough to house Ōtsutsuki Isshiki's power, which faintly exceeded the limits of this world.
Therefore, after completely taking control of Jigen's body, Isshiki did not rush to emerge. Instead, he chose to remain hidden and prepare a truly perfect