Start the time travel simulator from Sky Sister!

"An orange talent is enough to destroy Demon Slayer World. I don't even dare to think about the red and gold talents."

You couldn't help but sigh, this was really too exaggerated.

Now that I don't even have to do anything, can the Upper Moons just be killed at will?

Although the battle was won in the original novel, it was far from easy.

If this poison were to spread to the members of the Demon Slayer Corps, it would be quite serious!

Chapter 17: A House Full of Children and Grandchildren, the Invincible Wuzhan

【…】

[After the incident was over, you returned to the Butterfly House, and you realized that the final battle was not far away.]

[You made a large amount of recovery potions and gave them to the Demon Slayer Corps.]

[If you pour this potion on a broken hand, it will grow back like a ghost. It is quite practical. 】

[Because of your great help, Shinobu Kocho is very grateful to you. Your contribution can greatly reduce the death rate of the Demon Slayer Corps. ]

[In the following time, Kanroji Mitsuri also often came to the Butterfly House to look for you, and Nezuko and Tamayo soon discovered your secret. ]

[The mature Tamayo didn't say much, but Nezuko said that you are a philanderer, but she didn't say much either, after all, polygamy is allowed in this world. ]

[Also, the relationship between the three girls is actually not bad, so no one wants to break up this relationship, but who is in charge of your room every night... is a difficult problem. ]

[As for Dakimakami, due to her status, whether you pamper her or not is entirely up to you. ]

【…】

[The pillars began training, seemingly preparing for the final battle. ]

[But these are none of your business. After all, you are relatively Buddhist. But you are more worried about Kanroji Mitsuri, so you sent Daki to follow Kanroji Mitsuri. ]

[If possible, it is best to save Kocho Shinobu again. After all, Kocho Shinobu may die, but the probability of her death is not that high this time. ]

[As long as Shinobu Kocho injects the poison into Upper Rank 2 Douma's body, she will win. This is not difficult for her.]

[But someone must inject the drug into Muzan's body. Originally, that person should be Tamayo, but you don't want Tamayo to take risks.]

[So... now you have accepted this job, even though Tamayo did not agree to it, she is obviously worried about you. ]

[But after a night of discussion between you and her, Tamayo was forced to agree, and asked you to get married when you return. She also pinched your lower back hard, complaining that you were too rough and asked you to be gentler next time.]

[But if you are too gentle, Tamayo might not be forced to agree to you...]

[Although Tamayo asked you to go, she also wanted to follow you because she was still worried about you...]

【You agreed. 】

[In the past few days, you have used the blood of an upper-rank demon to create a potion to strengthen your body, giving you the recovery, defense, and attack power of an upper-rank demon. However, as a human, you still have a lifespan limit.]

[Although it is made of ghost blood, it has been improved by you, so it is not afraid of sunlight and has no side effects. ]

【…】

"This kind of strengthening potion!? It can directly strengthen it to the upper level... It's a bit incredible."

"You know, even if an upper rank has its head chopped off, it won't die. Even if its recovery ability is not as strong as Muzan's, it's still pretty terrifying."

You was completely stunned.

Is there any medicine that I can’t make myself?

Is this going to be incredible?

But they are still human beings after all. Even if they retain their abilities after transforming from ghosts to humans, their lifespan is still limited.

It's a bit too far-fetched to get into medicine to this extent.

Is this the value of the orange talent?

【…】

【A few days later. 】

[You received the news that your lord was stabbed, and you instantly realized that it was Muzan who came. Tamayo and you quickly set off for the lord's mansion. ]

[Soon, you are here. ]

[However, the entire mansion has been reduced to ashes, and Muzan's body is gradually recovering from the skeleton. ]

[You took out the potion, appeared in front of Muzan in an instant, and sprinkled it directly into his internal organs that had not yet recovered.]

[Muzan roared angrily, having no idea what you spilled, and his body recovered faster...]

[But the potion has begun to take effect, and his recovery speed has begun to slow down. His newly recovered head screams angrily. ]

[As a result, you took out the iron stick coated with poison and it instantly burst into flames. You used the stick as a blade and hit Muzan's head directly.]

[Wuzan's curse was halfway through when his voice suddenly stopped, but you didn't finish yet and took out another iron rod, forming a double rod flow.]

[The two sticks transform into red swords, burning with scorching heat, and you keep hitting Muzan with "Shua, shua, shua".]

[Because of the horrible drug and your powerful strength, his recovery ability can't keep up with your speed of destruction. ]

[Causing him to turn into a pulp of flesh in terror, and instantly explode in all directions! He felt the fear of Tsugakuko Yoriichi from you! ]

[You gritted your teeth. You didn't expect that he would escape. He didn't even have the slightest intention of resisting! ! ? You yelled for the pillars to destroy the piece of meat! ]

[Many surrounding pillars also rushed over at this time and quickly chopped off the scattered pieces of meat! ]

[However, this Muzan's speed of escaping was extremely fast, and he simply abandoned most of his flesh and ran away. ]

[He was even forced to flee because of your horrible potion, and he didn't even dare to let you enter the Infinite City! Instead, he instantly teleported himself into the Infinite City. ]

[You know Muzan is scared, but you have confidence in your potion. Even if you can't kill Muzan, he's no different from being dead.]

【A few days later.】

[The frequency of ghosts appearing in various places is decreasing, and it seems that everything is developing in a good direction. 】

[You are married to Tamayo, Nezuko, and Mitsuri... and you have a very good relationship with Shinobu Kocho and Kanao. ]

[Under your careful planning, Shinobu Kocho and Kanao were also planned by you. 】

[Shinobu Kocho seems to have seen through your thoughts and asks if you want to marry her and Kanao. ]

[You agreed, and two more people joined your harem. You are even happier. Nezuko, Tamayo, and Mitsuri are all pregnant. You have a child.]

【Three years later.】

[With your philandering personality, there is really no way to stop you from including Kanzaki Aoi in your harem. ]

[Shinobu Kocho and Daki are also pregnant, you are very happy. 】

[There are almost no cases of ghosts hurting people. It seems that the number of ghosts is decreasing.]

【Seventy years later.】

[You have continued to study medicine and have reached the pinnacle of perfection. You can even achieve immortality.]

[However, Tamayo, Kocho Shinobu, Mitsuri...they are all dead, and only Kanao and her children are left by your side, so you don't have any intention of living any longer. ]

[But recently, ghosts have appeared frequently. Actually, you guessed it... At that time, you suspected that Muzan was not dead. ]

[Or... after Muzan returned to the Infinite Castle, he turned another person into a demon king, just like how Tanjiro was turned into a demon king in the original ending...]

[Recalling all this, you also understand that even such a powerful potion cannot kill Muzan. ]

【One day.】

[You are awakened by screams, and you see the bodies of your children and the elderly Kanao... The person standing in front of you is Kokushibo!? ]

[Yes, Muzan is indeed dead, but before he died, he merged the spirit in his cells with the body of Kokushibo! Let Kokushibo become the new Demon King! ]

[The one in front of you now is both Muzan and Kokushibo. 】

[The demon king Kokushibo told you everything. You still wanted to resist, but you found that you were already weak. Aging made your strength only at the lower level. 】

[Because we have been at peace for too long, and I don’t have the habit of carrying anti-ghost potions. ]

[Facing the demon king Kokushibo, you were defeated in seconds. 】

【you are dead. 】

【…】

"call--!"

After reading all this, You felt inexplicably heavy.

This Muzan is really an invincible cockroach!

He also combined with Kokushibo before he died, right?

How outrageous!

Chapter 18 This is just a "story" (っ????)

【Ding--】

[Solution successful, the time travel simulation memory has been issued to the host, and this simulation records the "Demon Slayer" file: "No. 004". 】

[This evaluation is A-level, and you can choose two out of five rewards from the following simulations. 】

[1. Upper-rank level recovery ability + physical strength + transparent world. ]

【2. Experience in romantic exchanges. 】

【3. Obtain all medical knowledge in this simulation. 】

【4. Adjustment experience + Water Breathing Enhancement. 】

[5. The power of the Red Blade is enhanced + the Breathing of the Sun is enhanced. ]

You was stunned.

The memories in my mind emerged like a movie. I didn't expect that I was so crazy and was only A-level.

Do I have to kill Muzan to reach S-rank?

"Hey--"

You sighed, looked at the reward above, and slowly said:

"The first upper rank's recovery ability + physical strength + world transparency are definitely amazing. This is really cool. I must choose it."

"The third one also simulates my research results of nearly a hundred years, which is also very meaningful..."

“另外2、4、5着实提升太小了……我选1+3，也就这两个有点实际提升了。”

As the words fall.

An even more powerful force suddenly emerged from You's body, making him feel comfortable all over.

He looked at his hands and indeed felt that the cells were much more active.

At the same time, memories of medical knowledge flooded into my mind, which is a huge amount of knowledge.

But with the help of the system, I was fully integrated in an instant.

"If this kind of recovery medicine, enhancement potion, or poison could be made in this world, it would be a game-changer."

"But...some elements that exist in the Demon Slayer world may not exist in this world..."

"Even if you need to make medicine, you still have to go to the Demon Slayer world to get the materials yourself."

You stroked his chin in thought.

Because the simulation ended, the time around them started to work again.

"Yu-kun, what are you thinking about?"

Ying looked at Youshi who was thinking and asked curiously.

Yuya finally reacted.

"Well... nothing."

"Let's eat quickly~"