Demon Slayer: Muzan, will you dance too?

The system rated his swordsmanship fairly highly, but that doesn't mean his true strength was comparable to that of a Chunin or Jonin.

Most of the rewards offered cannot be used because of a lack of chakra.

It's as humorous as throwing him into ancient times, giving him a submachine gun, but not giving him bullets.

If someone has a great talent for shooting, the weapons they can use will vary depending on the era and context.

Ordinary crossbows are naturally no match for sniper rifles.

They might all be able to kill accurately within 100 meters, but 500 meters or 1,000 meters would be far beyond the former's limit.

Given the limitations of the world, Kiyokawa Izumi was naturally very interested in the so-called Eight Gates Formation.

He didn't think he could use it, but after studying the principles, he wondered if he could create the most basic version of the basic version.

The training of this taijutsu also requires chakra. Kiyokawa Izumi is different from Rock Lee. Rock Lee is non-attribute, while Kiyokawa Izumi really doesn't have chakra.

As a transmigrator, he had a general understanding of this taijutsu—the setting was that there were eight gates in the body that suppressed chakra, and once the restrictions were lifted, the chakra could be released overloaded, gaining power far beyond the limit.

Kiyokawa Izumi, who was born without this kind of energy, was very interested, but he would not choose this ninjutsu.

Techniques such as the Flying Thunder God Technique follow the same principle.

Getting these is like getting firearms without bullets; you can't use them and can only stare at them helplessly.

In the current situation, the only way to achieve a qualitative change in strength is to choose a reward that does not rely on chakra.

The swordsmanship passed down in the Uchiha clan, or the so-called Konoha style, is certainly worth studying, but it is not entirely free of chakra.

Kiyokawa Izumi didn't think that learning these things would raise his swordsmanship level by another level.

His swordsmanship is already honed through countless trials, and in terms of level alone, it is on par with his elder brother's. How could he possibly break through it by simply referencing it?

"If I can't awaken the markings, then let's try the breathing techniques of another world."

Kiyokawa Izumi's breathing rhythm is showing obvious changes.

"Dark Breathing Lv3→Lv4"

He naturally chose the Seven-Day Invocation Technique, which was exactly what he needed at the moment, but the system had yet to reward him.

There's a reason why people keep criticizing the stupid system.

They give you some impressive but useless abilities.

It would be better to be more practical and give him an ability that isn't that powerful, but one that he can actually use.

The so-called Seven-Day Breathing Technique was created by Shira, a ninja from Sunagakure. Simply put, it's about improving bodily functions through breathing. The unique breathing rhythm and usage are worth studying because this world is based on breathing techniques.

Breathing has amazing power.

When a large amount of knowledge floods my drowsy mind, my mastery of Dark Breathing, after referencing the breathing techniques of another world, has seen a significant improvement.

At this moment, the only limitation is that his physical attributes are completely different from Zi Luo's.

In that worldview, ordinary humans have 130 trillion cells, more than twice that of Kiyokawa Izumi—the world he lives in is more like his previous life, where the normal cell count is around 40 to 60 trillion.

That's a difference of two or three times.

Their basic physical fitness levels are completely different.

Even if Kiyokawa Izumi could perfectly use the Seven-Day Breathing Technique, he could never reach the level of Zilu – he was simply born inferior.

The most basic value is two or three times yours. No matter how perfectly you replicate it, you can never surpass the original creator.

But what does it matter if there are differences?

The enemy Kiyokawa Izumi faces is not Madara or Kaguya from another world, but simply the Upper Five Gyokko before her, nothing more.

When his breathing rhythm changed, he could clearly feel the difference between his own breathing method and the Seven-Day Breathing Method. The explosive breathing when using the three silent stages was the closest to it.

However, the method of use is too crude and violent.

It means disregarding one's own limits and engaging in segmented excessive breathing at the expense of physical damage.

The Seven-Day Breathing Method is similar; it involves inhaling large amounts of oxygen to activate all the cells in the body.

It can even increase lung capacity to four times the normal level, which is terrifying.

Assuming a baseline lung capacity is the same as that of an average person, four times that capacity will significantly improve endurance, enabling prolonged high-intensity exercise and delaying fatigue.

It will boost immunity, accelerate recovery, and reduce the duration of muscle soreness.

A brain that receives more oxygen will experience improved cognitive function and concentration.

This assumption is still based on the values ​​of an average person. What if the initial panel values ​​were three or four times that of an average person? It would only be more exaggerated.

The improvement that Kiyokawa Izumi received at this moment far exceeded his previous burst state—having never awakened his markings, he didn't know what that felt like.

But I think it should be pretty much the same, right?