Start the time travel simulator from Sky Sister!

[The "Nada Spider Mountain" plot begins. This time you and Shinobu Kocho go to support Tanjiro and the others. ]

[You used a potion to turn all the ghosts into humans, including Nezuko! ]

[Everyone is shocked. You, Butterfly House, accept the female ghosts, and leave the rest to the master for him to deal with.]

[This includes the Lower String Five who has transformed into a human - Lei. 】

[The lord was even more shocked when he heard this. He never expected you to reach such a state.]

[However, when you met your lord Ubuyashiki Yoshiya this time and saw the disease he got from the curse, you immediately became interested. After all, theoretically, if you can remove Muzan's curse, you can also use potions to help him get rid of the curse.]

[And remember, in the original work, Muzan also took special medicine and turned into a demon. At that time, the lord who had a blood relationship with Muzan was cursed. Why couldn't the curse be cured by medicine? ]

[You extracted Muzan's blood, and used the previously stored ghost blood for debugging and research. ]

【…】

[In just two months, you easily prepared the antidote. However, when you went out, you heard that the Flame Pillar had died. But to you, this was not a big deal.]

[In front of all the pillars, you injected the potion into Lord Uzumayashiki Yoshiya's body. As expected, his originally disfigured cheeks instantly healed, and his eyes could see very clearly.]

[Your potion worked! ]

[Everyone was extremely shocked. You actually made the antidote that cursed the clan for a thousand years in just two months! ]

【But for you, this is not a big problem. 】

[But it’s not over yet. Next, you injected the antidote into all the children in the birthing house.]

[Although this medicine is difficult to explain, it is indeed effective, and if it goes as expected, Muzan... and all the ghosts will be backfired! ]

[Because... the reason why Muzan and the demons have infinite life is that they were absorbed by the Ubuya family through the "curse" of their blood, and they have been absorbing it for thousands of years! ]

[The two are of the same bloodline, and their bloodline has a special connection like quantum entanglement. Then, using "drugs" as a trigger, the balance between the two is tilted, turning into a "special curse" to erode the future vitality of many people on the other side. ]

[To be honest, because of the special connection, if all members of Ubuyashiki Yoshiya's family really died, Muzan's life span might also have come to an end. This time, you discovered this shocking truth in your research.]

[After all, if the connection between them is a balance, the balance of vitality between the Ubuyashiki clan and Muzan Kibutsuji, ordinary medicines really can't cure it, and can't cut off the "curse" between the two, so what you spent most time on in the past two months was looking for medicine. ]

[On the other hand, Muzan may also gain vitality by eating humans, but it is not a big problem. ]

[Because of your medicine, the opponent will spit out all the vitality absorbed through this power, and then completely break the curse. It's that simple. ]

[You also explained these things to Ubuyashiki Yoya. ]

[That is to say, Muzan Kibutsuji has used up the remaining vitality in the cells obtained through the "curse", and it is almost time for him to go to hell. ]

[This kind of thing, I guess only the person who made the medicine for Muzan Kibutsuji thousands of years ago knows a little bit about it. I guess even Muzan Kibutsuji himself doesn't know... Unfortunately, Muzan found that the medicine was useless after taking it, so he killed that person. He didn't expect that this was a chronic medicine. ]

[If he wasn't from the Ubuyashiki clan, how could he have become so powerful? And he calls himself a perfect creature? And those demons that Muzan turned into using his own cells...]

[It's just the power gained from another blood relative! ]

【How ridiculous! 】

【…】

"I...wipe?"

"No, I have also researched this..."

"I remember the original book didn't mention it... It just said that it was because of Muzan that Ubuyashiki was cursed, but that old bastard author didn't explain what exactly happened..."

"Damn, I have to go to Demon Slayer World myself to figure things out a little bit."

"But that's true, this is too abstract... If the Ubuyashiki clan is destroyed, there will be no Muzan, which is really ridiculous."

When You saw this, he felt inexplicably moved.

But the two tribes are originally from the same lineage, so it is normal to have such a setting.

Chapter 26: S-level evaluation, talent reward

【Everyone was shocked to hear the truth you explored.】

[Tell everyone that the curse has been broken by you. Now may be the best time to eliminate the ghosts. If nothing goes wrong, all the ghosts will be greatly weakened! ]

[Hearing you say this, Ubuyashiki Yoya also laughed, and directly commanded the Demon Slayer Corps to do as you said, and began the plan to annihilate demons with all their strength! ]

[Soon, all the pillars disappeared from their original positions.]

[Before leaving, Shinobu Kocho and Kanae Kocho couldn't help but glance at you. ]

【But Ubuyashiki Kazuya told you that he had long believed that you were the one who changed the situation. 】

[You feel strange, and suddenly remember that Ubuyashiki Kakuya seems to have the ability to see the future, so you ask him if he has seen his own future? ]

[Ubuyashiki Kazuya shook his head and told you... it is because I cannot see your future that I think you are changing the situation.]

[You just laughed. I didn’t expect that the lord is also a gambler…]

[However, you glanced at Ubuyashiki Yoshiya's daughter and asked Ubuyashiki Yoshiya to give his daughter to you as payment for this transaction.]

[Ubuyashiki Kazuya was stunned for a moment, but still smiled and told you that it was okay, but you have to ask them for their own opinions.]

[You look at the white-haired girls and ask for their opinions.]

[And the four daughters of Ubuyashiki Kōya, Ubuyashiki Hinami, Ubuyashiki Hikaru, Ubuyashiki Kanata, and Ubuyashiki Kōna, surprisingly had no objections at all! ]

[Because you broke the curse that has plagued their clan for thousands of years, it is completely fine even if all four of them marry you.]

[You were very satisfied when you heard this answer, but they were still young, so you told them to work hard to become your wives in the future.]

[So, you just take them to the Butterfly House and start training these child brides! You have to raise your wives from childhood! ]

[As for Nezuko who turned into a human... she was also forced to do something after being given some ingredients. After all, the Butterfly House is your territory, so this is not a difficult thing to do.]

[Your harem gradually grew larger, and you ate all the beautiful girls in the Butterfly House who were over 18 years old, and you didn't let go of some of the younger ones.]

[You also raise the four daughters of the Ubuyashiki family as your wives. Is there anything happier than this? ]

【…】

“This is the Harem King…!?”

"Oh my goodness!"

"Not just the harem king, if this happened in the harem... he would definitely not let any of the maids go!"

"No, the abnormal attribute here suddenly seems to have overshadowed its original highlights."

You was really stunned when he saw it.

Exceeded! Too much!

Is this a harem?

This is a stud!

But he continued reading.

【…】

[After the Demon Slayer Corps's blanket purge, it was discovered that the demons are indeed much weaker now, and some demons even have much weaker vitality. ]

[The Demon Slayer Corps has the poison you gave them, and killing these weakened demons is so easy.]

[The Butterfly House is not only a medical institution, but also a pharmaceutical institution. It has poisons, antidotes, recovery drugs, and all kinds of drugs. ]

[You are too lazy to deal with things here, so now Tamayo is the main person in charge of this aspect. ]

[After all, Xiao Ke can walk now, and is almost five years old. Besides, everyone in Butterfly House knows him, so Tamayo doesn’t need to worry too much. ]

【About three months passed.】

[There is no trace of ghosts anymore. In fact, there are not as many ghosts in the world as imagined. There are only a few hundred or a thousand at most. ]

[The ghost who was so reckless before is now so quiet that you even suspect that Muzan is dead, but you can't find any trace of him and don't know whether he is dead or not.]

[This situation is a very helpless one. As long as Wuzang does not show up, you will never find him. ]

[But you suspected that Muzan was very likely dead. After all, there was no news, so you lost interest in him. ]

[We have been searching for Ubuyashiki Yoshiya, but we still can't find any trace. ]

[Ten, twenty years passed just like that…]

[Your harem is growing bigger and bigger, and you have more and more children, but there is still no news about Muzan. ]

[When you were 124 years old, the Demon Slayer world had already arrived in the modern era, but your harem had reached thousands, and you were known as the man with the most wives in the world - the Harem King.]

[But Muzan still didn't show up, maybe he's dead... You don't know. ]

[At the age of 136, you ran out of ammunition and food, not a drop of food left, and died of old age, on a bed surrounded by beautiful women. ]

【A perfect life. 】

【you are dead. 】

[Simulation ends, simulation settlement begins...]

"Invincible..."

"I died of old age. Sure enough, I can only die of old age at my level."

Yuu couldn't help but complain.

But deep down you are a little curious whether Muzan really died in the end?

It's not true that the curse of Ubuyashiki Yoya has been healed, and the Demon King Muzan has died? !

This is too simple. Won’t it be easy to just go through it casually in the future?

【Ding--】

[Solution successful, the time travel simulation memory has been issued to the host, and this simulation records the "Demon Slayer" file: "No. 005". 】

[This evaluation is S-level, and you can choose three out of six rewards from the following simulations. 】

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

【2. Knowledge of bed positions. 】

【3. Harmonious harem experience. 】

[4. Swordsmanship genius "Purple talent."]

【5. Medical Saint "Orange Talent".】

【6. Knowledge of techniques for picking up girls. 】

As You recalled this memory, he couldn't help but sigh that it was such a happy and fulfilling life, but in the end, he died surrounded by beauties.

As I recall, I was 100 years old and still had schoolgirls as my harem... It was really incredible, he was worthy of being the harem king.

Looking at the panel in front of me, I was suddenly slightly surprised. I didn't expect that I could actually choose talents! ?

"I thought talents couldn't be chosen..."

You complained silently.

[Tip: When the host reaches S-level, talent rewards will be given.]

Let me start with the system explanation.

Once this is said, you will understand it instantly.

"In that case, choose 1, 4, or 5."

"The rest is useless. I feel like this kind of experience and knowledge is not very useful."

You spoke frankly.

He must choose talent, so that his initial talent will increase, and it will be relatively easier to go to other worlds later.

Moreover, these initial talents can be substituted into reality. As long as one has the "Medical Saint" talent, he will be able to easily obtain all kinds of medicines in this world.

After all, many elements of the two worlds are different, but... talent is universal in both worlds.

Followed by.

You felt a lot of medical knowledge and memories entering his mind, and a mysterious warm current flowing into his body.