Xia Shu didn't dare compare herself to Tsunade, this was not modesty, in front of Tsunade, all medical ninjas would feel ashamed. In the previous life, the fifth Hokage Tsunade left two deep impressions on Duke. The first was the terrible omen that could make Newton die with his eyes open. You can refer to various TXT, JGP, RMVB, which have very detailed descriptions. The second was her medical ninjutsu that could still jump around after being cut in half.

As the most powerful of the three ninjas, Tsunade's medical skills are unparalleled and unprecedented. In the ninja world, no matter the enemy or the ninja, when seeing Tsunade, they will respectfully address her as "Tsunade-sama", which is an affirmation of her strength and the highest respect for this medical saint who saves the dying and heals the wounded. After World War II, Tsunade left Konoha and did not encounter any difficulties from enemy ninjas. On the contrary, after learning about her, the first thing they thought of was to seek help, which shows the high level of her medical skills.

Duke had no way of contacting this legendary figure who was at the top of all medical ninjas. He also only heard of the other two Sannins who were still in Konoha. Duke was deeply shocked every time he came to this point. You have to know that other time travelers at his age had already become brothers with Jiraiya, studied reincarnation techniques with Orochimaru, and even more, successfully captured Tsunade and had a large harem.

Duke, who was five years old, was still raising dogs and struggling for life, while other travelers were already drinking milk in Tsunade's arms when they were five years old. When he was bored, he would point his finger at Minato Namikaze to practice Rasengan and Flying Thunder God to kill time. The bloody reality told Duke that he was just a complete loser and had a long way to go before success.

"Medical ninjutsu is a type of ninjutsu in which the practitioner uses chakra to stimulate cells to heal the patient's wounds. It can also achieve the effects of detoxification and attack through changes in form." After coaxing Hongdou to sleep, Xia Shu briefly introduced the definition of medical ninjutsu to Duke, and solemnly said: "Mastering medical ninjutsu requires not only precise chakra control ability, but also a lot of professional theoretical foundations, such as the distribution of the human body's internal organs, blood vessels, bones, meridians, nerves and acupuncture points. These medical theories are rough and boring, and it takes a lot of time and energy to master them. There is no shortcut except rote memorization. If you can't stand giving up halfway, you might as well give up now."

"I won't give up. I'm very talented in medicine!" Duke said confidently. As a medical expert who can rival lawyers, reading books is nothing. Besides, I've memorized it in my previous life. Now I just pick it up and study it again. As a top student, I can finish it quickly. What? You said I'm just a proctologist. These are not my specialties! Humph, what do you know about doctors? Proctologists are also doctors.

"Competitive boy, I hope you can really do what you say." Xia Shu did not criticize Duke for overestimating his own abilities. In the world of ninjas, adults are more likely to encourage the next generation.

"No wonder, but the Hokage's son is too talkative. Even if it's not confidential information, he can't tell everyone!" Natsuki suddenly realized, and then became a little dissatisfied with Asuma. Poor Asuma was innocently implicated.

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"This time I came to see Lord Slug because of this child. He wants to learn medical ninjutsu, so I need to retrieve the medical scroll that was stored in the Wet Bone Forest. I'm sorry to trouble you. Duke, why don't you go meet Lord Slug as soon as possible!" Xia Shu touched Duke's head and pushed him down, which was considered a bow.

"Goodbye then, Natsuki. I hope next time you will summon me as a medical ninja." After the slug said this, it turned into smoke and returned to the spiritual world.

"Don't worry about that!" Xia Shu smiled and said, "Unlike other summoned beasts, Slug-sama does not exist in the form of a group. In the entire Wet Bone Forest, there is only Slug-sama as a whole. Just like what I summoned just now, it was only a small part of Slug-sama's body, which is insignificant. Even Tsunade-sama cannot summon the complete Slug-sama, so the situation you described will not happen."

"I want to learn this trick, I also want psychic power!" Duke rolled on the ground, his eyes misty, looking pitiful, and started to act cute, as if he would not give up until he achieved his goal.

"Slug-sama lives in the Wet Bone Forest, a sacred place in the spiritual world, and has a contractual relationship with Tsunade-sama's family, but I am not Tsunade-sama's disciple." Xia Shu recalled the past and said with admiration: "The reason why I was fortunate enough to contract with Slug-sama is that when Konoha Hospital was established, the medical ninja system was not perfect, and everyone's medical level was too poor to save more people. Tsunade-sama was moved and took out the precious contract scroll, promising that excellent medical ninjas could leave their names on the contract. First, it was to motivate everyone, and second, Slug-sama is a rare medical summoning beast, which is of great help to medical ninjas."

Duke opened his mouth wide, pointed at the slug with a shaking hand, and cast a puzzled look at Xia Shu. Could it be that Aunt Xia Shu's hidden identity is Tsunade's disciple, otherwise how could you have Tsunade's unique summoning beast? No wonder Duke was so surprised. He was no longer a ninja rookie. He knew very well how precious this top-level summoning beast was. One in a million was not enough to describe it. In the ninja world, only true disciples can inherit the top-level summoning beasts, and it is not something that the teacher can teach the disciples to learn. If the fate is not enough or the summoning beast doesn't like you, you can't summon them even if you sign a contract. Yes, they are so willful! "Long time no see, Lord Slug!" Xia Shu bowed politely and said to the slug.

"Also, if Lady Tsunade uses summoning techniques during a battle and Lady Slug is summoned by someone else, wouldn't that be very embarrassing!"

Duke's answer made Xia Shu very happy. After he finished speaking, he stood up, bit his finger, made five seals, pressed it to the ground, and shouted: "Spiritual Technique!"

"In that case, let me see how far you can go!"

“Don’t have a stern face at such a young age!” Xia Shu came back to his senses and saw that Duke was a little depressed. He couldn’t help but rub his head and encouraged him: “If you want to be recognized by Master Slug, you must first become a top medical ninja. You have to work hard!”

"Haha!" Duke laughed awkwardly, Asma, I will never forget your sacrifice.

After sending the slug away, Natsuki heaved a sigh of relief, cleaned the liquid on the scroll and threw it to Duke. Holding the scroll that was a head taller than him, Duke was excited and curious, and asked hurriedly: "That was the summoning beast of Princess Tsunade, one of the three ninjas! Why does Aunt Natsuki have such a powerful summoning beast? Is Aunt Natsuki a disciple of the three ninjas?"

"Really? That's not bad!" The slug nodded, with both comfort and blessing.

So that's it! Duke suddenly realized. No wonder all the ninjas who could have a contract with Slug in the original book had excellent medical ninjutsu. It turned out that summoning her was conditional. If you didn't meet the standard, she would ignore you! "Even so, there must be many medical ninjas in Konoha Hospital who have contracted with Slug-sama!" Duke wondered. As a top summoning beast, and a rare medical type that can fight and heal, it would be a bit of a loss to be contracted by so many people.

"Does it require Lady Tsunade's consent?" Duke speculated. After all, he is a contracted beast of the Senju clan, so he needs her nod.

"It's Natsuki. It's been a long time. I heard that you've given up your ninja identity and become a full-time wife!" Slug's voice was very gentle, just like the intellectual big sister next door. Among the three ninjas' summoned beasts, she had the best temper, and of course the weakest combat ability, but she was more outstanding in medical treatment.

"This is the Duke I know. Don't look so stern, kid!" Xia Shu said, "But there are conditions for becoming a medical ninja. I need to test your chakra properties first."

"It's useless, even if you try to act cute." Xia Shu was overwhelmed by the cuteness, but still shook his head and refused.

"Lord Slug..." Duke was still in a daze, his limbs a little stiff.

"It's not a problem. It originally belonged to you." The slug said as its boneless body slowly squirmed and spit out a huge sticky scroll with the word 'Medicine' written on it.

"You also know Mr. Slug, don't you think you have good taste?" Xia Shu asked curiously. "Ah! I heard Asuma say that when I was in school." Duke threw the blame, but Asuma caught it steadily.

"Also, Lady Slug has very high standards. She rejected many medical ninjas with strong abilities. I was just lucky. At that time, in the entire Konoha Hospital, apart from Lady Tsunade, there were only three medical ninjas who were recognized by Lady Slug." Xia Shu looked sad and his voice gradually became smaller: "The other two unfortunately died in the war a few years ago. The mortality rate of medical ninjas on the battlefield is very high. The enemy will regard us as the primary target of attack..."

"Thank you, Mr. Slug."

"Do what you say, that's my way of ninja!" Duke borrowed a famous saying from someone.

"Don't worry! Aunt Xia Shu, I will never let you down." Duke cheered up. Death is scary. If you don't want to die, you have to work harder.

"That's not the case!" Xia Shu shook his head. "Whether the contract is successfully signed or not is not up to Tsunade-sama. Only Slug-sama agrees. Slug-sama only recognizes ninjas with strong medical ninjutsu. Otherwise, even if the contract is signed privately, Slug-sama will not recognize it."

"I'm sorry to disappoint you because I met a man I'm willing to give my whole life to." Natsuki apologized, but there was a warm happiness on her face.

Xia Shu reminisced about her past colleagues and stopped talking. Duke opened his mouth but didn't know how to persuade her. Death is always painful. Ninjas may not be afraid of death, but they cannot face it calmly.

"?" Duke was playing dumb. Although he had forgotten many details, he still knew the properties of chakra in Naruto. There were seven major properties: fire, wind, thunder, earth, water, yang, and yin. Five of them could be known with just chakra test paper, which was very convenient.

Medical ninjutsu should be related to Yang escape... Can chakra test paper also detect it? Duke was full of doubts.

"Although there is no direct evidence, water and earth are indeed the two most suitable chakra attributes for medical ninjas, followed by wind, and finally fire and lightning. Your water jutsu is very good, so it must contain water. As for whether there are other attributes." Xia Shu pointed at the wall clock, covered his mouth and grinned, "I will test you again when you come back from school in the afternoon. Now...if you don't get to school within three minutes, you will be standing in the corridor!"

"ah----"

(End of this chapter)