Start the time travel simulator from Sky Sister!

[Kuroshibo can't help but secretly curse you, you are simply a monster! ]

[At this moment, Muzan's body instantly began to age. He was stunned and didn't understand what was happening to him.]

[Not only Muzan, but the surrounding demons are also like this. Their skin, cells, and strength...all begin to age! ]

[“It’s over.” You smiled contemptuously, looking at the four aging ghosts, and said it without any care. ]

[Just now, the potion that Ubuyashiki Yoya injected had already broken the curse. Now Muzan is really starting to wither away, and it looks like he will die soon. ]

[What is going on here?! ]

[Muzan looks at his aging skin, roars at you, and asks you what you did. ]

[You smiled and said that since Muzan Kibutsuji can turn into a demon by taking medicine, let Muzan Kibutsuji's other bloodline, the Uzumaki branch, be cursed...]

[You can also let Ubuyashiki and his family take drugs, and reverse the process to turn Muzan Kibutsuji back from a demon to a human, and let Muzan Kibutsuji spit out all the vitality he deprived others of! ]

【…】

"Come to think of it, in the original novel, Ubuyashiki Yoshiya's son, Ubuyashiki Teriya, seems to be the oldest man in the future..."

"Perhaps it is because after killing Muzan, he gained a lot of vitality from Muzan, so he can live so long?"

You murmured.

After all, this statement is different from the original work and is still very reasonable.

Perhaps this is the answer given by Demon Slayer World...

【…】

[You lazily called the other pillars to stop watching nervously. This group of ghosts has been greatly weakened. They can take action now.]

[These pillars finally reacted. After all, many of them were encountering Upper Ranks for the first time, and you killed four of them at once...]

[How could they not be stunned by this sudden change? ]

[After they realized what was happening, they quickly began to attack. ]

[But these weak upper ranks and demon kings are vulnerable! ]

[After just a few moves with the pillars, he was easily beaten to pieces! ]

[They were obviously very weak, and most of their bodies had even turned into rotten and smelly human bodies. They were no match for these pillars.]

[Without the blessing of the "special curse" in Muzan's cells, they are just a group of humans, and they are humans from hundreds or thousands of years ago... How long can they live? ]

【…】

【It's all over.】

[It felt so sudden and unexpectedly relaxing... None of the Pillars died.]

【No one died in this battle! 】

[You even felt that this battle was too boring, and planned to practice. The other pillars were still there, so you let the other pillars practice with you. Of course, you changed your weapon to an ordinary iron rod.]

[You let all nine pillars attack together. They understood your strength and didn't say much. While you were training with them, you also learned all the breathing techniques of the nine pillars.]

[Even... use their breathing method to defeat them all! ]

[You didn't even spend much time, it's not even daybreak yet.]

【All the pillars were dumbfounded. 】

[Ubuyashiki Yoya was very pleased to see this scene. He hadn't even recovered yet and felt that everything was a little unreal. After all, he had already made up his mind to die.]

[But it's so easy... When you told him that this medicine could break the curse of two blood relatives, he didn't quite believe it... But if you can do it, everything will end...]

【In fact, you really did it. 】

【Ubuyashiki Yoya never thought that he would live to see the end. 】

【…】

【A few months later.】

[Because of Muzan's death, the Demon Slayer Corps was disbanded, but you still live in the Butterfly House. ]

[You also took Xie back at this time, and found out that Nezuko was pregnant. It was undoubtedly your child. Nezuko didn't even know whose child it was, but you told her it was yours.]

[She was in a daze, but she did have a crush on you. Although there were some setbacks, your relationship got better and better thanks to your flirting skills, and you got married later.]

[And because you were interested in doing drug research, you lived in the Butterfly House and brought Tamayo and the others over. ]

[When Nezuko found out you had a child, she was confused, but she soon accepted it. After all, what else could she do if she didn't accept it? ]

[She has belatedly fallen in love with you, and is pregnant. She can't live without you, and doesn't want to leave you. ]

[After the Demon Slayer Corps was disbanded, the Butterfly House became a hospital, providing treatment for the injured, and Shinobu Kocho was the boss here.]

[Although everything is over, your practice is not over yet. You keep practicing every day, just like a demon. ]

[You not only practice swordsmanship, but also pure physical strength, making your body quite strong. ]

[And, during this time, you even attacked Shinobu Kocho, and discussed the birth of life with the little sisters in the Butterfly House. ]

[After all, you who have learned medicine... you don't lack women. ]

[Whichever one you want, just secretly place a few... ahem, that's it. ]

【…】

[Fifty years have passed, and your strong physique has attracted many women. ]

【You and many other women have started to study the subject of life. 】

【…】

[More than fifty years have passed.]

[You are over a hundred years old, but you are still alive. ]

[Most of the people around you have died, and you understand that although it is joyful to give birth to life, it is even more sad when life dies.]

[You can only continue to practice... to share your sorrow. ]

【…】

[More than fifty years have passed.]

[You are 160 or 170 years old, and you are still exercising. You are in great shape and can even do push-ups with one finger. All your skills have reached the peak and it is difficult to make further progress!]

[At this point, even without using poison or removing the curse, you can still kill six upper rank monsters and Muzan alone! ]

【But in modern society, it is completely useless. 】

【…】

[A few decades later.]

[You are two hundred years old, but you are still alive...]

[But in recent years, you have seen Shinobu Kocho, Mitsuri Kanroji, Tamayo... and Nezuko, your wives... their reincarnations are really as beautiful as they were in the past...]

[You still love them very much, but when you stretch out your dry hands to them, you realize that you and they are no longer from the same world.]

[You will protect them in secret. ]

[Unfortunately, they no longer recognize you and just think you are an old man doing fitness on the roadside.]

【…】

[Five years later, endless practice has made you the strongest in loneliness! ]

[At the end, you closed your eyes, but your body still maintained an excellent vitality. You died at the age of 205...]

【you are dead. 】

……

Chapter 35 Kasumi Shiko

"Huh... is it over..."

Yuu murmured softly, leaning back in his chair with a relaxed look, revealing a faint smile and saying, "Sure enough, even if we beat Muzan and all six upper ranks, it's just as I expected."

"There is no pressure at all. After all, in the file "No. 005" we know important information about the Ubuyashiki family and Muzan."

"I also got the knowledge to make a potion to remove the evil spirit. Now I can basically control Muzan. There's nothing much to say about that."

"Even if we go to Demon Slayer World, it's just a formality."

【Ding--】

[Solution successful, the time travel simulation memory has been issued to the host, and this simulation records the "Demon Slayer" file: "No. 002". 】

[This evaluation is SS level, you can get rewards from the following simulations, you can choose four out of eight. 】

[1. Breathing of the Sun (Enhanced Version) + Breathing of Water (Total Sword Types, Enhanced Version) + Breathing of the Moon + Breathing of Flame (Total Types, Missing Types , , and ) + Breathing of the Insect + Breathing of Rock + Breathing of Wind + … [Expand]]

【2. All medical knowledge acquired this time. 】

【3. Transparent World (Enhanced) + Physical Strength (Enhanced) + Red Blade (Enhanced).】

【4. Stealer "Purple Talent".】

[5. Rising momentum "Blue Talent."]

【6. Compassion for all living things [Blue Talent].】

[7. Transform maggots into dragons [white talent].]

【8. Love experience and knowledge.】

"It seems that medicine hasn't developed anything new this time. It's basically the same as before..."

"But is this talent of transforming maggots into dragons serious? But how should I put it... it feels quite meaningful."

Yuu absorbed the memories, and smiled softly, "I choose 1, 3, 4 and... 7!"

"After all, who would complain about being longer?"

His words trailed off.

The body suddenly began to undergo a wonderful change, and the whole body was greatly strengthened again.

Then, the time around him was restored.

Recalling the memories of two hundred years, You sat on the chair and couldn't help but sigh at the long time.

And in the end, he narrowly escaped the reincarnations of Shinobu Kocho and the others.

"If possible...I really hope they can always be by my side."

You sighed.

[Warm Tips: After the host completes the world clearance mission, he will completely clear the world and gain control of the world and open the "God Authority". The host is the only god in the clearance world and can control everything and have the highest power. ]

"Shit?! If you clear the world, you will become the god of "Demon Slayer"!"

"Is there such a good thing?"

You is overwhelmed by this system.

Wouldn't that mean I'm invincible in the Demon Slayer world?

[The host can control everything in the world through "Demon Slayer World", such as:]

[First, it can bring the life inside into the host's world. ]

[Secondly, it can control the time difference between the host's world and the Demon Slayer world, or directly pause the time of the Demon Slayer world. ]

【Third, you can enter the Demon Slayer world at will, or bring others into the Demon Slayer world.】

【…】

[There are many other things you can do. You will know once the host clears the level. ]