"Sharingan... what secrets does it truly hide..."
Inside Ryūchi Cave, Kato Osamu stared into the Sharingan within the glass test tube.
The black Tomoe within those blood-red eyes seemed capable of devouring all light, possessing the profound depth of absolute darkness.
The test subject lying on the operating table had already fallen into endless slumber after undergoing soul deactivation treatment.
A healthy body and a robust physique were materials that would make any researcher in the Shinobi World light up.
He did not know where Orochimaru had found such an almost perfect test subject. Orochimaru had his own channels for acquiring subjects, and Kato Osamu had never asked.
"The recipient transplant experiment is ready..."
The low voice of another Kato Osamu working at the research bench drew the attention of the other four Kato Osamus in Ryūchi Cave entirely toward the operating table.
"Begin the transplant..."
Standing before the enormous screen, Kato Osamu gently set down the test tube. With a single thought, the other five clones swiftly and methodically began their tasks.
They quickly connected every monitoring device to the test subject's body, and the Chakra Scalpel in their hands suddenly swept across his eye socket.
For Kato Osamu, who had long mastered the human body's meridians, replacing a pair of eyes was not difficult with the aid of Chakra.
Receiving the images from the vision of all five clones at once, Kato Osamu's mind raced.
His spiritual energy had already surpassed that of an ordinary Jonin countless times over, yet he felt no discomfort whatsoever.
As the shimmering green light of the Mystical Palm Technique slowly illuminated the Ryūchi Cave laboratory, Kato Osamu fixed his gaze on the various readings on the display—they began to fluctuate violently.
"Connect to the test subject's consciousness. Channel Chakra into the Sharingan,