Start the time travel simulator from Sky Sister!

But You didn't think too much about it. He would know what would happen after the simulation.

"Let's continue the simulation..."

[Time travel simulation is starting...]

[On the first day, I unexpectedly appeared in the Infinite Castle and met Muzan Kibutsuji...]

[I learned from Muzan Kibutsuji that I am a member of the Demon Slayer Corps. 】

[But you are not afraid of him. Through your sudden memories as a time traveler... you know that he treats human life as nothing, which makes you very angry. Suddenly, your red sword, sun breathing, transparent world, upper string physical strength, spotted physical strength and other series are superimposed, and your terrifying strength directly explodes! ]

【“What do you think of life as… Muzan!” You start to drink at Muzan. 】

[Muzan Kibutsuji, who originally wanted to devour you to obtain information about the Demon Slayer Corps, suddenly seemed to have seen a samurai from hundreds of years ago. His legs became weak with fear, and he suddenly shouted at Mingnu to send you away! ]

[You quickly ran towards Muzan, and when you saw the blade cut into half of Muzan's neck... you were teleported away.]

【…】

[You find yourself in a snowy night. You vaguely remember that this place seems to be near the Kamado family.]

[Look up at the snowy mountain. If nothing unexpected happens, the Kamado family lives on the mountain.]

[And if I remember correctly, Muzan would kill Kamado's family, and you, who cherish your life, would immediately go up the mountain to protect them. ]

[Crossing the snowstorm, you walked towards the Kamado family, but it was still dark, so you didn't go in to disturb them. Instead, you picked up the Sun Blade and began to practice.]

[You sighed that practicing can not only keep you away from the cold, but also improve your strength. It is such a wonderful thing, and you continued to practice crazily. ]

[The next day.]

[It was dawn, and Tanjiro just walked out the door and found you practicing swordsmanship. He also found that the heat from your body melted the snow around you, and he was immediately surprised. ]

[He walked up to you and looked at you curiously, and you told him that you were a member of the Demon Slayer Corps. ]

[At this time, Tanjiro still didn't know much about ghosts, and you told Tanjiro that ghosts are man-eating monsters, and that he must run away if he sees one, and that you are here to kill ghosts.]

【Tanjiro admires you very much and invites you to his home to chat, and you agree. While chatting, you realize that this time period is still a bit early. Logically, Muzan will come in a year or two.】

[You were a little surprised, after all, you just arrived here and didn't know the time, but you didn't leave immediately. You rested at Tanjiro's house for a few days and got closer to Nezuko. ]

[But most of the time you are practicing, Nezuko and the others will watch you practice, and sometimes they will even learn to practice from you. ]

[Since you have a wealth of medical knowledge, I plan to go to Tamayo and leave the Kamado family. ]

【A few days later. 】

[When you get to Tamayo, she's a little surprised that humans found her location, but she's impressed when you show your strength.]

[After you easily turned her back into a human, she was completely shocked. She never thought you could do this.]

[While studying medicine, you have become more and more interested in giving birth to life, but what you are more curious about is... can humans and ghosts give birth to life? ]

【At this time, you regretted turning Tamayo back into a human. 】

[However, as a time traveler, you naturally know where the ghosts are, so you made some potions and planned to go there.]

[A few more days passed.]

[You went to the Natian Spider Mountain. You knew there were many ghosts there, so you went into the mountain at night.]

[For you, it's a good opportunity to catch a few female ghosts and study the topic of human and ghost reproduction. ]

[Those ghosts were no match for you, and you easily eliminated them all, leaving only three ghosts, which you named "Qi", "Fen" and "Xie".]

【…】

"Aren't those the three ghosts from the previous save?"

"It's still the same name..."

"The same archive is so strangely similar..."

You complained silently.

Then he continued to look downward.

【…】

[You cut off their connection with Muzan, but did not restore them to human form. Instead, you began to study whether they could give birth to life with humans.]

[You tied up the three of them with chains and injected life essence into their bodies dozens of times a day. You regarded this as a form of cultivation.]

Chapter 32: The Combination of Humans and Ghosts

[And to them, you are the devil, locking them all up in chains, doing this all the time, and not giving them food or water.]

[Your side can be described as a monster, with a never-ending motivation almost every day. ]

[They haven't eaten humans for several days, and then you locked them up and tortured them. They are going crazy.]

[You are curious about whether this paste you made is also a part of being human. You wonder if they are interested in eating it, so you feed them some out of curiosity.]

[But after tasting it, they are extremely excited and ask you to give them more, but this is not enough.]

[You are surprised. This is information that you don’t have in your memory. You didn’t expect that they would even eat their own food, and even beg you to give it to them…]

[But you stayed in that Spider Mountain for a long time, sometimes even cutting off her hands and feet and using her as a pure pleasure tool.]

[After all, they are ghosts and can grow back, so it doesn't matter to you. However, they haven't eaten human flesh and blood for a long time, so their recovery is not good at all.]

[In addition to keeping company with the three female ghosts, even if you practice every day, after about two months, your strength has increased a lot, and you find that two of the female ghosts are pregnant! ! ]

[It's "Even" and "Divided", but the seemingly largest "Slant" didn't get pregnant. Do you think this may have something to do with their bodies? After all, the body "Slant" is actually the smallest... I don't know if it has developed. ]

[But the original bodies of "Qi" and "Fen" are relatively large, so they are definitely still developing. In this way, you have come up with a new result: whether a ghost is pregnant is most likely related to the age of the original body when it turns into a ghost, and has little to do with the appearance after becoming a ghost.]

[But the white hair they transformed through the power of tiredness is really beautiful, and it is exactly what you want. ]

[When you were about to give birth to the child, the two ghosts had already lost consciousness and only struggled madly from time to time, asking you for food.]

[You raise another question: What is the difference between the children born by "ghosts that eat people" and "ghosts that don't eat people"? ]

[So you found the place where the spiders in Natian Mountain stored their food, and gave the dead and rotten human corpses to "Qi" to eat, and as for the "Fen" next to it, you were forbidden to feed them.]

[However, after eating, "Qi" was surprisingly well-behaved. He was not as greedy as some ghosts. He seemed to just want to eat normally and have enough energy to maintain his sanity.]

[She seems to have fallen in love with you despite your torture, and she wants you to torture her more, and she even wants to be tortured even when she is pregnant. ]

[You also feel that she is somewhat abstract. ]

[The "Fen" next to you went completely crazy. When he saw you feeding the "Qi" next to you, he started roaring at you. ]

[You disliked her being a little noisy, so you pulled out her tongue. ]

[Although you have compassion for life, why should you have any compassion for a ghost that has taken countless lives? ]

[Keeping them alive is the greatest mercy! ]

【Ten months later.】

["Qi" gave birth to a little girl, who seemed to be a little ghost girl, craving for human flesh and blood. ]

[And because "fen" had not eaten, it gave birth to a lump of flesh, and it looked like a dead fetus. ]

[As for why Xie hasn't gotten pregnant yet, it's because her human body hasn't fully developed, and she no longer develops after becoming a ghost.]

[This research took a year, and it ended perfectly. You tortured the three of them and developed a close relationship with them.]

[You gave them a potion that would turn them into humans but retain their blood vampire skills, ghost recovery ability, and strength. You also gave the half-human, half-ghost baby girl the potion, because after all, she was your child.]

[These three people become your servants. Normally, they are in their original human form, but when they use the blood demon art, they will turn into a white-haired state, which is quite unique...]

[The "slant" that originally looked like a mother has now turned into a child that shrinks around you every day and looks extremely scared. ]

[The other two girls seemed normal, but Fen seemed to be a little weird because of your abuse. She would make mistakes on purpose from time to time in order to get you to spur her on.]

[“Qi” is more honest, still taking care of the baby every day, and will tell you directly when she wants something, blatantly seducing you, giving birth to a child, and becoming more bold after becoming a human.]

[You have felt the beauty of nurturing life this time, although the child you gave birth to with a ghost is a little strange... After all, you have already turned the child into a human. ]

[It's about time now, so you went to Tamayo's house to restock your medicine.]

[Tamayo was surprised to see you surrounded by women and even having a child. When you showed her your research report, she didn't expect you to do such a thing.]

[You sighed at the beauty of nurturing life and invited Tamayo to nurture life with you. Speaking of which, Tamayo is now your disciple~]

[Although Tamayo's heart is moved by you, she is also conflicted inside, after all, there are too many women around you. ]

[Seeing that Tamayo was still considering it, you didn't say anything more, but started to leave here, planning to go to Tanjiro's house again. ]

[As a member of the Demon Slayer Corps, you should have a crow with you to contact the headquarters, but you don't have one. You suspect that it might be because you entered the Infinite Castle when the crow didn't come in and didn't know where it flew to.]

[But it doesn't matter to you. Although he is a member of the Demon Slayer Corps, he doesn't like being bound. ]

【A few days passed.】

[This time you should bring Xie with you to Tanjiro's house. Her true form is a child, so it's convenient to bring her along. After all, there are too many people and Tanjiro's house won't be able to accommodate them.]

[It happened to be night when you were almost there, and you smelled a bloody smell and heard screams.]

[You feel something is wrong and run to the house in front of you. At this moment, Muzan is starting to slaughter people! ]

[At this time, Tanjiro is still protecting his family, Tanjiro did not go down the mountain! ]

【Muzan arrived earlier than you expected! 】

[You quickly drew the Sun Blade from your waist, the red flame flickered in the night light, and instantly slashed at Muzan! ]

【“Asshole… who the hell are you!” Muzan suddenly shouted when he saw you appear. 】

[He left suddenly a year ago, but after coming to his senses, he felt that your strength could not be as strong as that warrior.]

[Even though every cell in Muzan's body is trembling, I will test your strength this time. ]

[Countless rope-like tentacles suddenly emerge from his body and attack you! ]

[But these are nothing to you now. You have to know that as a cultivation maniac, you practice every day! ]

[Red flames burned the blade, and the blade quickly slashed at the tentacles, cutting them all off in an instant! ]

[Your speed at this moment is exactly the same as the man that Muzan saw back then! ]

[That...Tsugikoku Yoriichi! ]

[But this kind of thing is simply unbelievable... How could this kind of thing be possible? ]

[There is no other monster like Tsugumi Yuichiro in the world! ]

Chapter 33: Plan? Decisive Battle!

[Muzan quickly dodges your attack and keeps attacking you like crazy, with those tentacles attacking you like whips.]

[But there is no doubt that all of them were cut off by the red sword in your hand, and you concentrated all your strength to cut towards Muzan. ]

[But at this moment, Muzan disappeared in front of him in an instant, apparently being teleported away again. ]

[“Damn it! He escaped again!” You cursed. ]

【At this time, the “Xie” behind was completely stunned. She recognized the aura just now... It was actually “that adult”! 】

[I never expected that the man in front of me, whom I recognized as my master, could actually force "that adult" to retreat... It's amazing! ]

【“Xie” was filled with amazement and quickly ran to your side, looking at you with admiration. 】

[Fortunately, the Kamado family didn't suffer any real injuries, but Nezuko and Aoi were injured and were lying on the ground. ]

[You used potions to restore their bodies, but you did not wake them up. You wanted to turn them into one of the two people who would cultivate life with you.]

[You didn't say much, just told them to get more rest, but in the dark you gave them all sleeping pills.]

[Then you need to start to breed life with these two girls directly. There is one girl who is too young to breed life, so you exclude her.]

[Even though the two women are unconscious, their bodies still seem to respond. However, your length is too long, so it is more than enough to deal with them. ]

[You didn't drug "Xie", she is very well behaved and will assist you. ]

[You continued to do this to the two girls every day. One day during the day, you suddenly remembered the blue spider lily and asked Tanjiro if he had any impression of it.]