Shinji immediately gave her his approval. "The seal works well. It's enough to block the perception of ordinary Sensory Ninja."
"That's great!"
Karin looked delighted.
After circling Karin to inspect her, Shinji offered a few more pointers. "The sealing technique is still a little rough, though. You can practice more once you get back and further reduce the risk of exposure. Also, your Chakra is too vast right now. The Sealing Jutsu carved into an object won't receive a steady supply of Chakra, so it'll lose its effectiveness quickly. You'll need to maintain it every day."
"Yes!"
Karin committed each point to memory.
Shinji said no more and instructed her, "Head back, and be careful on the way!"
After Karin left, Shinji didn't hurry off. He carefully cleaned the cave, erasing every trace—including the withered trees that had sprouted when Karin's Chakra ran wild during the surgery, and the Suppressant that had dripped onto the ground. Only then did he slip away.
Even after returning to his apartment, Shinji could barely contain his excitement.
It wasn't until he'd taken a shower that his emotions gradually settled.
He sat at his desk and opened his notebook, as if comparing the three First Hokage cells transplant surgeries he'd performed on Yakumo, the Sunagakure volunteer, and Karin.
After those three surgeries, he could probably be considered an expert in the field.
Still, he knew that the Medical Ninja overseeing the operation didn't play a particularly large role. What truly determined whether the surgery succeeded was the ninja lying on the operating table and receiving the transplant.
Even so, he had to keep refining every detail and do everything he could to improve the surgery's success rate.
It wasn't that he had a researcher's spirit. He was simply preparing for his own First Hokage