The universe begins with Demon Slayer: Kimetsu no Yaiba

 In short, it took nearly ten years to complete the core tasks of the super-dimensional travel system and achieve the conditions to unlock the next world.

Although the subsequent world stories cannot be recorded, after Bai Yu traveled to several worlds and gained 100% of the power of the dimensional wall, he finally gained recognition from the super-dimensional travel system and became a person who can travel through any dimensional world at will. Dimension traveler of existence.

Haku Yu, who gained 100% of the power of the dimensional wall, immediately chose to open the door to the world of Demon Slayer and returned to the place where he started.

 Because this world is of great significance to Bai Yu, there is a pregnant woman waiting for his return. Although for that woman, her wait is not long, but for Bai Yu, it is a hundred years.

 After traveling for centuries, Bai Yu is now over a hundred years old. It is probably because Bai Yu's lifespan is much longer than that of ordinary people, so even if he is a hundred years old, Bai Yu's face still looks young.

It's just that compared to before, Bai Yu's eyes are deeper and the temperament exuding from his body is also deeper.

Bai Yu, who returned to the world of Demon Slayer, landed near the withered ancient Higanbana tree. At this time, the mess here had been cleared up. Bai Yu did not see the Demon Slayer team responsible for logistics { The hidden members are here.

Although it has been a hundred years, Bai Yu still clearly remembers that this was the place where he and Onimusuji Muzan finally fought, and it was also the place where he released the [Five Elements and Bagua Formation].

Since this ancient tree exists, the timeline should be correct, but the people from the Demon Slayer Squad are not here. The only possibility is that they have left.

 Bai Yu has no intention of walking to the Demon Slayer Headquarters. After all, the Bai Yu now is no longer the Bai Yu before. Bai Yu's ability to accurately transfer space is now as simple as raising his hand.

So Bai Yu used the power of the dimensional wall to open the space crack according to his memory, and then walked into the space crack.

Through the space crack, Bai Yu accurately returned to the small courtyard outside the butterfly house. At this time, many people gathered in the small courtyard. Everyone crowded outside the mansion and seemed to be inquiring about the situation inside the house, so no one noticed Bai Yu's appearance.

Just when Bai Yu was wondering what all the members of the Demon Slayer Squad were doing in the wooden house, a woman's roar suddenly sounded in the wooden house. That kind of sound was the sound that women would make when it was very difficult to give birth. Generally, Making such a sound is basically a sign of difficult labor.

  With a petite body like Butterfly Ninja, it is normal for dystocia to occur.

 Bai Yu soon heard the voice, and at the same time, he also heard from the voice that it might be the voice of Butterfly Ninja, and he couldn't help but feel a little confused.

Hakuyu remembered that when he eradicated Tsuji Mukai, the Butterfly Ninja's belly had not yet swelled. Could it be that a few months had passed since he came back?

Bai Yu walked into the crowd, patted one of them and asked, "Hey! What's going on inside? Why are you all gathered here?!"

That person did not turn around, but felt that Bai Yu was talking nonsense. After all, this matter was a major matter that all members of the Demon Slayer Corps were extremely concerned about, and no one would be unaware of it.

"Brother, you are not confused! Today is the day for Lord Butterfly to give birth, and that is Lord Bai Yu's child. You don't know this, right? Lord Bai Yu defeated the ghost hunter Kibutsuji Mumei. The most powerful ghost hunter of the Demon Slayer Corps, Master Bai Yu’s child will definitely inherit his honor!" Although the man did not turn around, he still spoke very excitedly.

Hearing this, Bai Yu couldn't help but murmured: "He is really my child!"

As soon as Bai Yu said these words, the old man immediately became uneasy. The man immediately turned around, then looked at Bai Yu and said, "Brother, you are just daydreaming! You can eat whatever you want, and you can't say anything." Don't talk nonsense, what do you mean by your child! That is the result of the love between Butterfly and Bai Yu! "

Because this person's voice was very loud, when other people heard this, they all followed the voice and looked over. In just a few seconds, everyone's eyes were focused on Bai Yu, some with sharp eyes. People couldn't help but recognize Bai Yu, but they were not sure, so they murmured: "This man looks like Lord Bai Yu!"

 “Yes! I have seen Mr. Bai Yu, it does look like him!”

 “Didn’t Lord Bai Yu die together with Muzan Onibatsuji? Someone dares to impersonate Lord Bai Yu! This kind of thing can never be forgiven!”

 In the crowd, everyone started talking among themselves.

 Bai Yu just smiled and said nothing, without explaining much, but he immediately jumped up to the second floor in the next second, and then entered the house from the pavilion on the second floor.

 Bai Yu's speed was extremely fast, and the others didn't notice Bai Yu's movements at all, but suddenly found that Bai Yu had mysteriously disappeared from their sight.

 Such speed even made many people wonder if they were hallucinating.

 “Where are the people?!”

 “Is it possible that Lord Bai Yu’s soul has come back!?”

 Because of this sentence, those people began to worship one after another. In the context of Demon Slayer: Kimetsu no Yaiba, the people living there still believed in ghosts.

Suddenly, some people began to worship. As soon as this person took the lead, others also knelt down to worship.

Bai Yu, who entered the house, followed the sound and found that the sound came from the first floor. It is estimated that Butterfly Ninja chose the first floor to give birth.

Although he has never set foot here for a hundred years, Bai Yu is still very familiar with the place where he once lived. Soon Bai Yu came to the first floor. In the corridor on the first floor, Bai Yu saw Nezuko, Tanjiro, Kanao, My wife, Zenitsu, Kanzaki Aoi, Inosuke, Hattori Kujo, Tomioka Giyu, Kanroji Mitsuri, Purgatory Anjuro, Utaka Tengen, and Immortal Sakawa Saneya were all waiting hurriedly in the corridor outside the house. There was a sense of solemnity and worry on everything.

　　No one noticed that Bai Yu was standing not far away watching them at this time. This was because Bai Yu's current level was no longer within their reach, and they could no longer feel the presence of Bai Yu's aura.

The butterfly ninja's screams were still heard from time to time in the house. It was obvious that this birth was very painful and fatal for the butterfly ninja.

Just when Bai Yu was about to intervene, a child cried, and at the same time there were excited exclamations from other women: "It's a boy! It's great! Bai Yu is having a baby!"

The butterfly ninja was covered in sweat at this time and was in a very weak state. However, when he heard the boy's words, his weak expression also showed joy, as if this was something worth being happy about.

The serious expressions of the other people waiting outside the house also changed immediately because of the new movement in the house. The child was born safely, which is a good thing and a good thing for the entire Demon Slayer Squad.

"It's quite lively here!" Bai Yu finally said to Tanjiro and others who didn't notice his presence.

As soon as Bai Yu spoke, other people's eyes followed the voice and looked over. When everyone's eyes saw Bai Yu, everyone was stunned and seemed to have no reaction.

 “Senior Bai Yu!”

 Finally, Tanjiro broke the immersion and shouted very excitedly.

Tanjiro's voice looks very old and deep due to aging.

If it were in the past, Tanjiro would definitely rush up and hug Bai Yu, but now Tanjiro's physical condition has aged very seriously, so his body's reaction is very slow.

"Senior Bai Yu, is it really you? I saw it right! Are you still alive? Didn't I see a ghost?" My wife Zenitsu couldn't help but react from the daze, and at the same time she hugged her with great fear. Kanzaki Aoi, my wife Zenitsu still looks shady.

 “I’m here!” Bai Yu replied.

 Three simple words contain too much!

Although Bai Yu was standing in front of everyone, everyone still couldn't accept the fact that Bai Yu was still alive.

At this moment, the door of the house was pushed open from the inside. The weak Butterfly Nin held the door, then looked around the corridor, and finally his eyes were fixed on Bai Yu.

After Butterfly Ninja heard about the situation outside, she wanted to check it out in person regardless of her weak body, because Butterfly Ninja really longed for Bai Yu to come back to her, although that was just a luxury wish.

A smile appeared on Butterfly Ninja's weak face, and Bai Yu also smiled. However, Butterfly Ninja's inner emotions were very complicated, so she was dumbfounded and complained angrily: "You still know how to come back!"

 After saying this, the Butterfly Ninja's vision went dark, and his body fell limply toward the ground.

 Bai Yu was extremely fast. The moment he discovered that Butterfly Ninja had fainted, he almost teleported to the front of Butterfly Ninja and supported Butterfly Ninja in his arms.

By the time everyone reacted, Butterfly Ninja had already fallen into Bai Yu's arms.

 Then, Bai Yu used {Wood Breath} to regulate the butterfly ninja's body.

 Seeing Bai Yu support Butterfly Ninja in an instant, everyone knew that Bai Yu seemed to have become stronger again, so strong that he was completely out of the same level as them.

 After that, everyone accepted the fact that Bai Yu was back, and all kinds of greetings were indispensable here.

Then, Bai Yu settled down the Butterfly Ninja. During the time when the Butterfly Ninja was sleeping, after Bai Yu knew that Tanjiro was affected by the blue Higanbana and his body was aging, he immediately exchanged the system props and restored Tanjiro. .

Helping Butterfly Ninja to deliver the baby were Utsuo Tianyuan's wife and Bai Yu's other woman, Uyashiki Keiko. When Ubuyashiki Keiko saw Bai Yu appear in front of her, she was extremely happy in her heart, if it weren't for Butterfly Ninja. , she had already rushed into Bai Yu's arms.

The comatose Butterfly Ninja woke up again after taking a rest. After waking up, the Butterfly Ninja dimly saw a person sitting next to her. After the Butterfly Ninja saw this person clearly, she was sure of what she had seen before. It's not an illusion or a dream.

"Wake up!" Bai Yu couldn't help but chatted when he saw Butterfly Ninja opening his eyes.

Seeing that Butterfly Ninja wanted to get up, Bai Yu immediately held Butterfly Ninja's forehead and waist, then dragged her back and helped her up.

The Butterfly Ninja also took advantage of Bai Yu's support and hugged Bai Yu at once.

Then, Bai Yu heard Butterfly Ninja crying. Bai Yu knew that Butterfly Ninja was in a mood, so he comforted him: "It's okay! Am I back now?"

After that, Bai Yu lived inseparable with the two women, Butterfly Ninja and Uyashiki Keiko, and at the same time, he watched the children grow up day by day.

During this period, my wife Zenitsu and Kanzaki Aoi also got married as they wished, as did Inosuke and Hattori Kujo, even Tomioka Giyuu and Kanroji Mitsuri got together, and only Purgatory Anjuro and Immortal Kawa Minae Keep to yourself.

Utanayashiki Keiko’s younger brother, Utanayashiki Teruya, is a descendant of the previous leader of the Demon Slayer Corps. He also took over his father’s position and continued to run the Demon Slayer Corps with the assistance of Shiroha, his powerful brother-in-law.

When Ubuyashiki Keiko came of age, Ubuyashiki Keiko also gave birth to a child belonging to both of them for Bai Yu. The world became unusually peaceful because there were no more evil deeds by ghosts.

 Tanjiro and Nezuko also live in the Demon Slayer Corps with Shiraha.