There are many, many problems that Shinji needs to solve right now.

For example, several winding ghosts who escaped in the battle of the country of grass, such as 'Shangshu no Ichi' and 'Shangshu no Yan', are still lurking in all corners of the ninja world, which is a huge unstable factor.

For example, Orochimaru has begun to suspect his true purpose in healing Junmaro.

For example, the big barrel of wood on the moon, after another person dies, will it do something more radical, such as causing the catastrophe of the destruction of the world in advance.

And so on and so forth

But compared to these, what really hurts is the pollution problem of the ninja world!

Just as the mysterious man shouted 'all to the end' when he fled, Shinji confirmed with his own 'lamp' afterwards that the pollution of the Demon Slayer World to the ninja world has exceeded the critical value, unless Shinji can raze all the several countries centered on the country of grass to the ground, otherwise, the collision between the Demon Slayer World and the ninja world is inevitable.

This is also one of the reasons why Shinji did not rush to deal with those winding ghosts, and allowed all forces in the ninja world to study ghosts.

Because compared to the pollution that has been caused, the existence of those ghosts is nothing worth caring about.

As the 'lantern bearer' who guards the ninja world, Shinji certainly did not give up.

In his opinion, the mysterious people have repeatedly invaded the ninja world and brought pollution to the ninja world, and it is definitely impossible to fight and rush to the end with the ninja world from the beginning.

Doing so doesn't make sense to him, to the Demon Slayer World!

So behind his behavior, there must be some kind of reason that Shinji doesn't know yet, and this reason may be the way to save the ninja world in the end.

Otherwise, the ninja world may collide with the Demon Slayer World a year later, or even earlier, and then annihilate in the universe together.

And if you want to find out why the mysterious man invaded the ninja world, you must invade the demon world in reverse and find out the mysterious person.

But how difficult it is to find out the mysterious person who is the 'ghost king' on the other party's territory!

What's more, with the terrifying strength shown by the mysterious man in the battle of the Grass Country, even if Shinji really found him, without Nagato participating in the siege, he and the power under his command may not be able to deal with the mysterious man.

Therefore.

On the one hand, Shinji joins Tsunade's scientific research team, hoping that Tsunade can develop a poison that can restrain the high-speed regeneration of demons as soon as possible, and on the other hand, he is stepping up the promotion of the 'Reincarnation Eye Project' and the 'Reincarnation Eye Project', striving to have stronger strength when reversing the invasion of the Demon Slayer World.

It can be said that at this point, Shinji is completely in a race against time.

If Shinji is not ready to invade the Demon Slayer World in reverse before the Demon Slayer World collides with the Ninja World, or fails to catch the mysterious person, the Ninja World will disappear!

Midday.

Instead of taking a lunch break at the ninja school like the other students, Shinji rushed to the secret laboratory under the hospital and participated in the research and development of Tsunade's poison against demons.

At a regular small meeting, he spoke quietly: "The erosive poison has a very limited effect on it. ”

Yakumo said: "Corrosive poisons have a limited effect, and their cells and tissues have an extremely strong regenerative ability, and even the most corrosive poisons cannot fundamentally damage them. ”

At this time, another senior medical ninja said: "Bright light, burning these, has a certain effect on them, but it is not realistic to simulate the effect of the sun through poison!" ”

After a round of discussion, everyone frowned.

The regenerative ability of the ghost made them scratch their heads.

At this moment, Shinji raised his hand.

Under normal circumstances, he would only participate silently and would not express his opinions easily, but the discussion just now reminded him of several poisons developed by the Pearl World against the Ghost King Wu Miao in the original ghost destroying time and space.

One of them is an aging elixir!

There is a limit to the division of cells, even if it is a ghost with the power of the ghost king, it is impossible to be truly immortal, so in this case, why not develop an aging potion like Zhu Shi, crazy accelerate the aging of the mysterious person's cells, stimulate his cells to continue to divide, and make him fall into a state of aging and weakness in a very short time.

As long as he can do this, Shinji will be sure to take out the mystery man.

After all, unlike the ghost killing team in the original ghost killing world, he is a ninja who has mastered ninjutsu, body arts, illusions, pupil arts, sealing techniques, etc., so he doesn't need a powerful poison that can kill the mysterious man, as long as he can weaken the mysterious man's state, he is satisfied.

Tsunade looked at Shinji and asked, "Shinji, what do you think?" ”

Shinji didn't talk nonsense either, and immediately said what he thought.

"Causes cell aging and stimulates cell division at high speed?"

After listening to Shinji's thoughts, Tsunade fell into thought.

They had all fallen into stereotypes before, bent on how to destroy the oni's cell tissue, and Shinji's words undoubtedly opened up a new way of thinking for them.

Soon, Tsunade broke the silence and stood up and ordered, "Mute, it's up to you to test the cell sorting limit of the 'monster'!" ”

The 'monster' in her mouth is the code name of the ghost locked in the laboratory.

Mute immediately got up: "Yes!" ”

Tsunade looked at the senior medical ninja again, as well as Yakumo and Shinji, and ordered: "The medical team is responsible for collecting poisons that can cause cells to age quickly, Yakumo, Shinji, you also assist the medical team, once the project is successful, it will be considered as the completion of an S-class mission!" ”

The veteran medical ninja, along with Yakumo and Shinji, stood up together: "Yes! ”

After leaving the lab.

Yakumo said to Shinji, "Shinji, this is another rare S-class mission, we must do our best!" ”

"Uh-huh!"

Shinji nodded again and again, but complained in his heart.

Apparently.

This is Tsunade deliberately cultivating Yakumo, and under normal circumstances, it would be very good for a ninja involved in this project to settle an A-rank mission. Especially non-core personnel such as Yakumo, Shinji, who are struggling to get started.

And the reason why Tsunade generously settled Yakumo's S-level tasks was to increase Yakumo's qualifications and contributions, and pave the way for Yakumo's future.

After all, Yakumo, who successfully transplanted the first generation of cells, was no longer an outsider in Tsunade's eyes, and Tsunade's mind to cultivate her was completely undisguised.

It can be said that as long as there are no accidents, there is a seventy or eighty percent chance that Yakumo will become the next Hokage, or the next Hokage.

As for Shinji, being able to get the opportunity to participate in S-class missions several times as a ninja school student is purely stained with Yakumo's light.

They all participated in the same mission, and they couldn't be S-level tasks when Yakumo settled, and he only gave an A-level mission evaluation when he settled, and even if he agreed, the advisory elder group behind him wouldn't agree.

The second is even more served! Ask for a recommended ticket, a monthly pass! Hands-on, please!