"Not the damn cat again!" Naruto shouted in horror. Both Sakura and Sasuke sighed in agreement. Their bodies were already aching to the extreme. They didn't want to chase the cat around the village for hours in that state. In fact, they didn't even have any energy to do any mission. All the three of them wanted was to return to their homes and sleep until the next morning.

Unfortunately, Kakashi didn't give them any choice. Hiruzen was surprised to see the three Genins accept a rank D mission without asking for difficult missions for once.

Fujin received the memories from his clone and chuckled while thinking, 'Guess Guy will be proud of Kakashi. Hmm, maybe I should inform him the next time we spar. Oh well'

His expression became serious as he clenched his fists and exerted his strength.

'Gate of Opening: Open!'

'Gate of Healing: Open!'

'Gate of Life: Open!'

In one go, Fujin opened the first three inner gates. His skin turned red, his pupils disappeared, all the hair on his body stood up, and bulging veins appeared all over his body. At the same time, a high amount of chakra was flowing around his body.

'Gate of Pain: Open!'

Fujin exerted his body further and opened the fourth inner gate! True to its name, pain spread through his body as his muscles were affected.

Fujin gritted his teeth and muttered, "Here goes nothing."

Despite the pain, Fujin closed his eyes and focused on the chakra point in his abdomen. In an instant, a large amount of chakra bombarded the Gate of Limit. Fujin kept up the bombardment for half a minute. Despite the steady increase in the pain his muscles were feeling, the bombardment only became more fierce.

The Gate of Limit couldn't withstand it and snapped open. In an instant, Fujin felt a massive increase in his chakra reserves. Despite the pain, he could feel that his body was far stronger.

Fujin didn't move and instead just paid attention to his body. He thought, 'It's incredible that this body can generate so much chakra and improve my physical abilities to this extent. My chakra levels are more than ten times what I normally have.'

He sighed as he analyzed further, 'It's a shame that this chakra is in such a berserk state. If it was calm like my normal chakra and I could use it for Ninjutsu, I could have been able to injure a Tailed Beast!'

Fujin finally closed his inner gates. His breathing immediately became rougher and he felt an immense hunger. However, Fujin wasn't very concerned. He analyzed, 'With the Gate of Limit opened, I can stop training the Eight Inner Gates Technique as well.

The Gate of Joy is just too difficult to open. Even if I train my body with the same intensity for a few years, there is no guarantee that I'll be able to open the Gate of Joy. Instead, it'll only get more difficult as my body grows stronger.

From what Guy said, fighting against strong opponents is an important factor from here onwards. Only when in grave danger, will the body be able to put enough pressure on the Gate of Joy to open it. However'

Fujin had a helpless expression. Unlike Guy, who was much weaker than Fujin when he opened the Gate of Limit, Fujin was already a fearsome rank S ninja! The number of ninjas that could threaten him and were alive could be counted with fingers.

Fujin muttered to himself, 'The only way I could get into such a fight is if I fight with Ay, Onoki or some of the Akatsuki members. Or maybe by using Akuro's disguise to fight with Hiruzen, Jiraiya and Tsunade. Still, all of them are far more experienced than me and no weaker than me as long as I don't use the Flying Thunder God'

Fujin fell into deep thought. After a couple of minutes, he decided, 'Irrespective of whether I open the Gate of Joy or not, there is no harm in engaging in such battles. Though I have fought a lot for my age, the majority of my battles were against weaker ninjas from minor villages. The number of times I fought a rank S ninja is just too low. Compared to these guys who fought regularly during the Great Ninja Wars, I lack heavily in the experience department.

Oh well, once the range of my Flying Thunder God jutsu increases, I'll begin finding excuses to fight them. After all, why should I refuse their help to make myself stronger? Since they aren't doing anything important, they might as well help me a bit.'

Having made his decision, Fujin decided to go to Ichiraku to fill himself up. En route, he saw Naruto and his teammates chasing after a cat. Noticing their sluggish movements, Fujin commented, 'I don't think they can get up from their beds tomorrow Even Guy isn't this brutal. Oh well, it's none of my concern.'

Completely ignoring the fact that he was the reason for their current state, Fujin shamelessly went into Ichiraku and began treating his stomach.

In his basement, 4 large sheets of paper were placed on the floor at some distance from each other. Surrounding each paper were a dozen Shadow Clones. While Fujin was training his body, his clones had been working on the design for the Fuin Battlefield.

Since the design had to be created properly, Fujin was aware that it would take some time. It didn't make any difference whether it was he who was designing the battlefield or his clones. Hence, Fujin left it all to his clones while he began focusing on the other things.

After filling his stomach and returning home, Fujin opened the scroll that Hiruzen had given him. Understanding the importance of theory in this jutsu, Fujin read it carefully a few times.

After a while, he sighed, 'Kato Dan What an impressive talent From what Hiruzen informed me about him, he specialized in Fire, Wind, Earth, Yin and Yang Release. In addition, his chakra reserves were very high as well.

I wonder if this was a reason why Hiruzen didn't oppose much while giving this jutsu. It might be possible that all he did was just act so that he could get as many puppets from me as he could. After all, in terms of chakra natures, I and Dan are quite similar as Hiruzen doesn't know about my Lightning Release.

That said, I wonder why his chakra reserves were absurdly high Now that I think about it, he did help Tsunade recover her entire chakra including the chakra stored in her seal in the last war. Being able to fill up her seal is nuts. Does the Spirit Transformation jutsu help increase the chakra reserves? However, it could have also been due to the Edo Tensei. Oh well, I'll wonder about it later.

Coming back to the Spirit Transformation jutsu, it is remarkable. To be able to control the soul A normal person, actually, even most rank S ninjas, can't even feel their soul, let alone control it freely.

Just to be able to sense my soul, I'll need remarkable control over Yin Release. By extension, my control over Yan Release has to be remarkable as well. Though my current Yang Release and Yin Release aren't bad, I'll have to improve them significantly to just begin training this jutsu.

Once they improve, I will first have to sense my soul and differentiate it from my body. The next step will be detaching it from my body, allowing me to roam freely. In this form, I'll be invulnerable to normal chakra and energy. Even Nature energy won't be able to harm me. Unless someone develops attacks that specifically target the soul, I won't be harmed. That said, I could still be trapped within high-level barriers.

Anyway, the last step would be learning combat skills with my Spirit. The basic way of attacking with spirit is by entering the enemy's body and damaging his Spirit, or better, completely collapsing it. Straightforward and brutally efficient.

In addition, I can also take control of my enemy's body temporarily. I can also use this technique to communicate or transfer my chakra to an ally. Another important feature is the broken passive tracking ability. If I set someone as my target, my Soul will be able to find its way all the way to him even if I don't know where my target is.

Hmm I wonder if this jutsu was purposefully kept away from Jiraiya'

Fujin was genuinely surprised that Jiraiya didn't do everything he could to learn this jutsu. It seemed like the perfect jutsu for him!

Fujin continued reading the scroll over and over to ensure that he didn't miss anything. He noted down all the doubts he had as Hiruzen would be paying a visit later in the day.

The remainder of the day passed without any incident. Kakashi planned on training the kids once again after the mission was completed. However, he could see that they were completely drained. They didn't make a single move on him during the mission. As a result, he let them go home early.

Later that night, Hiruzen arrived at Fujin's residence along with the orphans from Kiri.