After the first successful example, Orochimaru conducted thirty more desperate virus injection experiments at the same time, and Karn also provided a lot of serum at one time, but all of them were used by Orochimaru.

If all of these people are successful, and then two more groups are successful, they can inject the rope tree and Karn with serum.

When he was at the experimental base, Orochimaru once privately approached Karn, wanting to exchange his hand for a tube of the serum of the Desperate Virus, which could be exchanged for all his ninjutsu savings; However, Karn did not agree to the deal, and instead gave him a tube of serum.

The creation of the Desperate Virus was not a difficult task for Karn, not to mention that Orochimaru didn't have anything he could do now, he hadn't seen the forbidden scroll now, and the ninjutsu on his body was still dominated by snake ninjutsu and escape arts.

Orochimaru's biggest value is himself, from now to Boruto, a total of about forty years, but Orochimaru has single-handedly developed biotechnology to the level of rejuvenation and cloning.

This kind of character, it's not too much to say that he is cursed by knowledge, and the reason why Orochimaru became a villain and is hated by everyone is because he didn't become the Hokage.

If he studies the forbidden jutsu after becoming the Hokage, he will become the same existence as the second Hokage, and he may be stronger than the second Hokage in biological research; After all, after Orochimaru became the Hokage, he probably wasn't in the mood to delve into politics against the Uchiha.

...........

While Orochimaru was conducting a batch serum test, Tsunade and Karn were also preparing to go to Konoha together.

Tsunade returns to Konoha every once in a while, and she is also tasked with reforming the medical system, and although many things are on the right track, and according to Karn's advice, one plan after another is going quite smoothly, Tsunade still has to take a look.

She is not like Orochimaru, although Orochimaru took a long vacation, she still has to use the shadow clone to do some B-level or C-level tasks, as for A-level and S-level tasks, it is difficult to complete it by relying on the shadow clone, and Orochimaru can't get out of it.

In Orochimaru's eyes, the experiment of the Desperate Virus Serum was much more important than Konoha's mission.

And after going back this time, Tsunade is going to bring Rope Tree over, and if the success rate of the experiment is high, she will make Rope Tree a ninja again, and after being injected with the Desperation Virus Serum, Rope Tree may become a ninja like her grandfather.

At this point, Tsunade was still very grateful to Karn, and at that time, Orochimaru also explained to Tsunade afterwards why he had to kill Tsuchishi, and after listening to the explanation, Tsunade also realized his naivety.

Fortunately, with Orochimaru's help, otherwise she would have committed something as stupid as the old man.

Karn went to Konoha or Tsunade repeatedly assured, and also said that Kushina always inquired about him, plus Karn also had some things to deal with in Konoha, visited the Uchiha clan, and by the way, told Yakushi Nonoyu some things.

Now that he may have been on the blacklist of Konoha, at least on the blacklist of the high-level people in Konoha, if he can't hire the ninjas of the Uchiha clan as guards in Konoha in the future, he may not even feel at ease walking.

Those guys dared to use Yun Ren to deal with him this time, and next time they dared to let the shadows take action.

"I don't know why Jiu Sinai has such a good relationship with you, you must know that she and the team members seem to get along well, that little girl is about to treat you as family."

Approaching Konoha, Tsunade complained to Karn that she felt like Kushina had asked Karn ten times more than she had asked her.

"Forget it, Tsunade, Kushina is a little younger, but she's not stupid."

Karn shook his head and said to Tsunade, "I remember that Kushina is from another village, and since coming to Konoha he has been hated by the people around him since he came to the ninja school, and that happened a while ago...."

It's okay to say if it succeeds, but because of Karn, the plans of the Konoha higher-ups have been sabotaged, and now Kushina should be in deep doubt.

The Konoha higher-ups may also be a little uneasy about Kushina, but Uzumaki Mito can't hold out for long, and they have no other candidates unless they give up the Nine-Tails; But no one would agree to the stupid choice of giving up the Nine-Tails, and if the Nine-Tails were captured by other ninja villages after being reborn, it would be an unimaginable loss for Konoha.

Those people have seen the whirlpool Mito in the nine-tails mode, and the power is far greater than that of the Ape Flying Sun Slash.

If you don't give up, except for Jiu Sinai, no one else can become a nine-tailed pillar force.

When Bo Feng Shuimen was at the peak of his age, he sealed half of the nine-tails, and his body was so paralyzed that he could barely move, if it was a whole nine-tails, even if it was an ape flying sun, he couldn't bear it, and only Chakra's special Jiu Sinai was suitable for becoming a nine-tailed human pillar force.

Tsunade couldn't reply to the matter of Jiu Sinai, this matter was the fault of Konoha, and after being silent for a while, she suddenly turned her head and asked, "I went to Konoha this time, and I lived in the land of the Thousand Hands Clan." ”

"Then bother you."

"You agreed so happily this time?"

Karn said helplessly: "After all, safety comes first, I have tried my best to avoid getting into trouble in Konoha, but I didn't expect trouble to find me..."

Tsunade thought about it for a while, but still didn't say the identity of Kushina, although the village didn't say it explicitly, but she knew the identity of Kushina; With the same red hair as Grandma Mito, Kushina also occasionally reveals that she has to learn sealing techniques with Grandma Mito, plus Grandma Mito's age...

Kushina should be the next Nine-Tails Pillar Force to be picked up in Konoha, but now Kushina is very close to Karn, a native of the outer village.

'The old man was probably in a hurry to do something stupid, and he offended two, really..."

Tsunade didn't know what to say to Sarutobi, and she couldn't think of a second word other than stupidity.

..................

"Boss!? You're here! ”

Towards the end of the evening, after a busy day and a boring D-class mission, Kushina returned home when he saw Karn and asked with a look of surprise on his face.

However, Kushina thought that Karn had not come back for such a long time, and had only asked Sister Tsunade to give her a few gifts, and even gave her a letter, and he didn't even regard himself as a friend, so he was still a little angry in his heart, and his little face instantly turned from sunny to cloudy to the table.

But before Kushina could speak, Karn pointed to the corner of the living room and said, "I'm sorry, because I've been busy with business for a long time, and these are gifts for you." ”

"So many are mine? cough~cough~, since you're busy with business, there's no way to do it..."

Kushina's eyes lit up when she saw the pile of gifts as tall as hers, but she instantly reacted that it was too fast to change, so she wanted to change back to the bitter and gloomy expression just now.

But the gifts and Karn were there, and Kushina couldn't pretend to be able to do anything about it, so she tried not to laugh, then washed her hands and sat down at the table, waiting for dinner with Rope Tree and Karn.

This time, it was Karn who had him bring a barbecue to his shop, and Tsunade only needed to open the package to serve it to the table.