What? My Teacher Is a Smoker? That's Absolutely Wonderful!

The massive infusion of Yang Release Chakra from before could certainly cause Respiratory Alkalosis, but it was far too obvious, had a very low success rate, and lacked subtlety.

Now that Kenichi Amamiya had improved it, he could diffuse Yang Release Chakra into the air around him, worsening other people's cancer continuously as they breathed.

So, in theory, Kenichi Amamiya believed this ninjutsu had the potential to develop into an area-of-effect killing technique.

But there was no need for that right now. He merely wanted to find out exactly how cancer affected a Chunin.

"Teacher, look here. This test subject's lungs have already begun showing early signs of Lung Cancer." Kenichi Amamiya spoke excitedly to Orochimaru. Just as he had expected, even a Chunin was still human.

As long as one was human, as long as one still needed lungs to breathe, one could not escape the effects of Lung Cancer.

Perhaps early-stage cancer would not affect combat ability too much, but what about the late stage?

What about the terminal stage?

Kenichi Amamiya had once visited relatives in a hospital's oncology department. Cancer patients in the late and terminal stages were pitiful. Their bodies could barely support movement; even lying down was torture, while intense pain constantly ravaged them.

As long as his experiment succeeded, enemy ninjas would steadily decline in Physical Fitness during battle. The longer they remained around him, the worse their condition would become.

"From your experiment report, the Delicate Illness Extraction Technique has no effect on this condition, correct?" Orochimaru had also noticed the difference in this Chunin. Looking at the other man's apparently normal lungs, he asked curiously.

"Yes, Teacher. After all, Cancer Cells are essentially normal cells produced by their own bodies, so they cannot be identified as harmful foreign substances." Kenichi Amamiya nodded.

He had previously asked the Medical Team to try curing those cancer patients, but so far, not a single one had succeeded. Only early-stage cancer had a certain cure rate; for the middle stage, it depended on Physical Fitness.

As for the late stage, there had not been a single successful cure, let alone the terminal stage.

Of course, that might also be because the ninja world's research into cancer was not particularly advanced yet.

"Continue. I want to see the late stage you mentioned." Orochimaru urged him on. He was becoming a little impatient. This manifestation was indeed very similar to Hashirama Cells.

Kenichi Amamiya nodded, though once it reached the late stage, this man would probably be close to death. By then, there would be no way to save him.

Soon, as Kenichi Amamiya continued infusing Yang Release Chakra into the Lung Cancer Cells, strange patterns gradually appeared in the Chunin's lungs. In the end, an irregular white depression even formed on the surface of the lungs.

This was the space-occupying manifestation of Lung Cancer Cells. Being visible to the naked eye already proved that the cancerous cells had grown very large.

"It takes too long, Kenichi. You need to improve that." Orochimaru shook his head, then nodded. The time required was far too long.

It had taken such a prolonged and continuous infusion of Yang Release Chakra to achieve this result. How could the battlefield possibly give him so much time to keep pouring Chakra into someone?

It seemed this ninjutsu still had enormous limitations for now. But as a method of ambush, it was quite a good choice.

For example, his teacher Hiruzen Sarutobi, who especially loved smoking.

"I understand, Teacher." Kenichi Amamiya scratched his head. Developing this ninjutsu was indeed somewhat difficult at present, but once he made a breakthrough, its future potential would not be small.

Lung Cancer Cells could be stimulated into appearing through Nicotine, but what about cancerous cells in other bodily tissues? He could not possibly search for them one by one, could he? That would be far too troublesome.

As for that issue, Kenichi Amamiya had an idea. When radiation had first been discovered in his previous life, it had been treated like a divine substance. There had even been cosmetics made with Radium.

Of course, people later learned that radiation could cause cancer, and they began avoiding it like the plague.

So Kenichi Amamiya's idea was to find those radioactive elements from his previous life in the ninja world. If he could create Nuclear Radiation...

After learning of the experiment's current progress, Orochimaru left. Before he departed, he told Kenichi Amamiya to record how long this Chunin could survive, along with his symptoms.

Kenichi Amamiya did not mind. Even if his teacher had not said so, he had planned to do exactly that. After all, a Chunin like this was rare experimental material.

After finishing his research, Kenichi Amamiya went out for ramen. This time, he went to Ichiraku Ramen.

Ichiraku Ramen had been open in Konoha for many years and had witnessed the growth of countless ninjas. When Rin Nohara was still alive, she had come here with Obito and the others for ramen.

Kenichi Amamiya also came here for ramen occasionally, because it really did taste good. It was just somewhat more expensive than the place he usually went to.

Kenichi Amamiya even felt that the previous ramen shop was cheap only because its ramen did not taste as good as Ichiraku Ramen's.

The moment he sat down, Kenichi Amamiya noticed a ninja taking a seat two spots away from him. That striking hair immediately told him who it was.

Kakashi.

Kenichi Amamiya glanced at Kakashi. Kakashi was the same as ever, but he had been appearing and disappearing unpredictably lately. Kenichi Amamiya figured he had probably joined the Anbu.

The Fourth Hokage, Minato Namikaze, had hoped that the Anbu's demanding missions would help Kakashi recover. Judging from the eventual outcome, it should have had some effect.

"Kamui..." Kenichi Amamiya clicked his tongue. The more he thought about it, the more suitable he felt this dojutsu was for him. But Kamui was currently divided between two people.

Kakashi would be easy enough to approach, but Obito would not.

Besides, Kamui was only complete with both eyes, and their space was the same. Thinking about it that way, whenever Obito had been in the Kamui Dimension, he had probably been attacked plenty of times by the Explosive Tags and kunai Kakashi sucked in.

When he thought of it that way, Obito seemed rather pitiful. And he truly loved Kakashi—he still had not gone to reclaim his own eyeball.

Kakashi remained expressionless, and Kenichi Amamiya had no desire to press his warm face against a cold backside. He simply ate his ramen quietly.

By the time he finished eating, Kakashi had long since left.

Kenichi Amamiya did not care. He picked his teeth with a toothpick and slowly headed home.

"Senior Brother Amamiya!" But after only a few steps, Kenichi Amamiya heard a voice that gave him a headache.

Anko Mitarashi had come again.