Night, Tsunade's house.

Mu Yue and Tsunade were in the study room making final inspections of various development materials for Yang Seal.

With the assistance of Tsunade, the best medical ninja in the ninja world, and the diligent practice of sealing techniques, Mu Yue is finally close to completing his power bank plan.

At this moment, Mu Yue is only one step away from the Yang Seal he imagined, which is to modify and perfect the Yang Seal already in his body. The specific theory is already very complete.

"I'm exhausted. It's finally over." Tsunade slumped on the chair without any image.

"But it's worth it, isn't it? Not only have I perfected the Yang Seal, but you have also completed the development of the Bai Hao Technique." Mu Yue picked up the teacup and took a sip with a smile.

Tsunade helped Mu Yue perfect the yang seal, and Mu Yue was also helping Tsunade complete the development of ninjutsu supporting the yin seal.

Without Baihao's technique, the Yin seal is almost useless.

Tsunade rolled her eyes and said angrily: "It seems to be mutual development and mutual benefit. I am not so eager to perfect the Yin Seal."

Tsunade studied the Yin Seal Baihao Technique purely to pass the time out of boredom, rather than to improve her combat effectiveness like Mu Yue did.

Because Tsunade is not planning to go to the battlefield, nor does she want to fight as a ninja like before, she has no need to improve her strength at all.

If it weren't for the Hundred Heroes' Art having some other wonderful uses, Tsunade wouldn't even bother to study it.

"You must make the supper more generous this time. It must be ten times as rich as the usual dinner!" Tsunade reminded with a serious look on her face.

In a sense, this may be a break-up meal, and Tsunade must eat a good meal.

It's not that Tsunade is ready to protect Konoha. Konoha is still in the whirlpool of war, and it's hard for Tsunade to leave.

It was because she felt that her interactions with Mu Yue would become less frequent in the future, and at least it would be difficult to come to her house to help with cooking.

Because the reason Mu Yue met Tsunade was because she wanted to learn knowledge from Tsunade and then develop the Yang Seal.

Later, the relationship got better, and Mu Yue gave some benefits, so Tsunade helped develop it together.

Now that the ninjutsu has been developed, Mu Yue no longer needs her that much.

Tsunade didn't have the confidence to let Mu Yue come to her house to cook unless she was asking for help.

After all, she is a Sannin, and Muyue is also the famous Lieyang Muyue, not an ordinary ninja.

"Okay, wait until I finish the last step to prepare a supper, a supper that will definitely satisfy you." Mu Yue nodded.

Developing the Yang Seal is not an easy task. If it weren't for Tsunade's help, it would have taken him several years to succeed.

So let alone making a sumptuous supper, even if Tsunade wanted to have a full banquet, Mu Yue would satisfy her.

Yang Seal is too important to him, even more important than a perfect level skill.

"This is what you said. If you are not satisfied, don't blame me for making further demands." Tsunade's eyes lit up.

"Yeah, that's what I said."

"Then take the last step quickly." Tsunade urged.

She can't wait to enjoy Mu Yuezhong's midnight snack that will definitely satisfy her.

Mu Yue is not a person who talks big. If he wants to satisfy her, he must show his true skills in cooking a feast.

In fact, even if Tsunade didn't push him, Mu Yue was ready to start. This was a ninjutsu he had started planning not long after he traveled through time. Now that it was finally developed, Mu Yue was not as calm as he appeared.

Although Yang Seal cannot increase his upper limit, it can increase his battery life, which is of great significance to Mu Yue.

"Huh." Mu Yue closed her eyes and adjusted her breathing, concentrating her breathing to the extreme to enter a state of transparency into the world.

His next operation requires a high degree of precision, otherwise he will be easily injured, and it will be internal injury. In severe cases, it may even damage the chakra meridian system.

This is also the reason why Mu Yue has to perform the treatment next to Tsunade. Even if there is an accident, Tsunade, the number one wet nurse in the ninja world, will be there to treat her.

The Yang seal before perfection is the same as the Yin seal without Bai Hao's technique. It cannot be said to be completely useless. It can only be said that it may be useful, but it is generally unlikely to be possible.

Of course, that is for ordinary ninjas, but it actually has a big effect on Mu Yue.

Because Mu Yue also had a small breakthrough before it was completely perfected. It was able to act on the shadow clone, and then release a trace amount of chakra to maintain the shadow clone at all times. This solved the problem of the shadow clone's existence time and made Mu Yue's multi-line operation easier.

The perfection of the Yang seal is essentially similar to the Baihao technique of the Yin seal.

However, the actual effects are different. The Yin seal automatically heals and enhances strength, while the Yang seal binds the breathing chakra mode to Mu Yue.

As long as the Yang Seal in the body is replaced, Mu Yue will have an extra chakra pool in the future, but this pool can only be used to use a certain breathing chakra mode.

"Breath of Fire, fire escape is currently the strongest." Mu Yue chose Breath of Fire.

There are considerable differences between different breathing methods, so the current Yang Seal only supports a single breathing method chakra mode and is not compatible with all breathing method chakra modes.

However, it does not have much impact on Mu Yue. If you encounter an enemy that must switch to breathing methods to deal with it, just turn off the Yang Seal.

After all, this is not the Eight Door Dunjia Death Door. Once it is opened, there is no way to close it.

When Mu Yue completed everything, he began to refine chakra and inject it into the Yang Seal.

When the chakra accumulated to a certain amount, Mu Yue stopped refining the chakra and opened her eyes, and a flame-like mark slowly appeared on her forehead.

"Succeeded?" Tsunade asked, looking at Mu Yue who was breathing calmly.

She doesn't have the ability to see through the world, so she can only rely on experience to judge Mu Yue's success or failure.

"It should be successful." Mu Yue felt the Yang Seal and then replied.

It turns out that the Yang Seal in Mu Yue's body can also store and release chakra.

The storage is okay, there is no problem if it does not exceed a certain amount, but the release of chakra is a big problem. A little more can easily cause chakra chaos.

It's different now. Mu Yue just tried to use the chakra inside the Yang Seal, but the chakra inside the Yang Seal didn't move at all.

This is the difference after perfecting the Yang Seal. The Yang Seal Solution is actually equivalent to entering the breathing method chakra mode. In the non-breathing method chakra mode, the chakra inside the Yang Seal can only enter and not exit.

"Let me check." Tsunade stood up and walked to Mu Yue's side, directly stretched out her hand and touched several important chakra points related to the Yang Seal.

"Perfect." Tsunade commented.

Even if Tsunade is allowed to do it herself, she doesn't have the confidence to do what Mu Yue did. This is an operation inside the human body.

"If you have accumulated enough chakra, enter the Breath of Fire Chakra mode and test it. If there are no problems, teach it to Kakashi." Mu Yue thought in her mind.

Of course Mu Yue wanted to teach his disciples such good ninjutsu as Yang Seal.

All of his disciples are big consumers of chakra, but their age and body limit their performance.

Except for Metkai, who has eight gates of Dunjia, the other disciples will be greatly improved if they can learn the Yang Seal.

But currently Mu Yue only plans to teach Kakashi.

Because the revised Yang Seal has a prerequisite for learning, which is extremely high accuracy in chakra control within the body.

If this condition cannot be met, learning Yang Seal is tantamount to self-harm.

This is why Tsunade and Jiraiya initially advised Mu Yue not to waste time on the Yang Seal. Mu Yue's intention in developing the Yang Seal was not something that humans could practice.

Only Kakashi, who also mastered the transparent world, could successfully cultivate Muyue's Yang Seal.

As for the remaining disciples, Mu Yue had no choice but to wait until they also mastered the Transparent World, or Mu Yue made further breakthroughs in the Yang Seal, lowering the difficulty.

"Now that it's done, let's prepare the supper quickly!" Tsunade urged, patting Mu Yue on the shoulder.

She already wanted to fast forward to supper time.

"If you are hungry, I will ask the shadow clone to go back and get some pastries to fill your stomach. It will take a long time to prepare the midnight snack." Mu Yue reminded.

Although Mu Yue has chef skills, this does not mean that all of Mu Yue's dishes are of the same level.

The more carefully Mu Yue works, the better the final dish will taste.

Tsunade helped Mu Yue a lot, and Mu Yue was naturally not stingy with time and would try her best to make the most delicious dishes.

Tsunade originally wanted to agree, but after thinking about it, if she ate pastries, she would have to eat less for the supper.

Although Muyue's cakes were delicious, Tsunade was obviously more attracted to the big meal.

"Go get it." Tsunade agreed.

Because she can save it for tomorrow, or give it to Shizune, so that she will eat less for midnight snacks.

Mu Yue formed a seal to form a shadow clone, and the main body began to prepare supper, and the shadow clone returned to his home in the main city.

Mu Yue had already prepared the required materials. She walked into the kitchen very skillfully and began to quickly process each material.

The sound of Mu Yue cooking was heard by Zhi Yin who was reading a book.

"Teacher Muyue, let me help." Zhiyin walked out of the room and walked to the kitchen and said proactively.

Shizune is not a freeloader.

"No, just leave it to me alone." Mu Yue declined.

Shizune hesitated for a while, but seeing Muyue's firm attitude, she finally nodded and returned to the living room.

Seeing Tsunade lying on the sofa, Shizune was angry and helpless.

This home is neither hers nor Muyue's, but Tsunade's.

As a result, Mu Yue was cooking in the kitchen, and Tsunade was lying dead in the living room without helping.

"Tsunade-sama, seriously, why do you want Teacher Muyue to make midnight snacks so late?" Shizune couldn't help complaining.
To be continued...