The plot is different from the original

"Y-You were about to defeat Muzan..." 

Even if Kagaya had heard this news beforehand, when he heard it from Isao's mouth, his face flushed red with excitement and anger!

Isao didn't hide anything, or rather, there was no point in hiding it. After all, he was about to complete the dream of every Demon Slayer, and he was sure that Shinobu, Kanroji, and every Demon Slayer who followed him to visit Tanjiro's village would tell everything.

Still, Isao knew that this would put Tanjiro into crisis, turning him into a sinner as he had caused him to lose a chance to end Muzan for all. 

Yet, every protagonist should face adversity to grow, and Tanjiro needs to learn what he did, or else he will cause more trouble in the future. 

As expected, the moment Kagaya heard everything from Isao, he was ready to grab Hashira's katana and cut down this bastard!

"You...! You...! You...!" 

The rest of Hashira, who heard Isao's story, also felt complex, wishing to beat up this bastard! 

At the same time, Tanjiro never said anything and just prostrated himself as low as possible. 

After they returned, Isao didn't take care of Tanjiro and his family since he knew that Shinobu or the others would take care of them. Naturally, they told Tanjiro what he had done, and Tanjiro understood what kind of gravest mistake he had made. 

If Tanjiro could save his family that way, then no one would say anything, but the family he had saved was already dead before he made his move. 

But well, no matter what, it was impossible for one to stay rational when it came to one's family, so Hashira could only feel conflicted. 

Yet, Kagaya was different since he really wished to cut Tanjiro down! 

If Isao could kill Muzan, at that time, Kagaya felt like even if Tanjiro and his family were sacrificed, it was all fine. However, he knew that he could do nothing to Tanjiro, and after a while, his hand slumped, and he lost all of his energy, feeling so helpless. 

Still, if Isao knew what Kagaya thought, then he would roll his eyes since he didn't want to become a bad guy who could sacrifice everything to achieve his ambition. Well, he was before, but he was about to become a father soon, so he had to change. 

Wait, what about before? 

Did he not change to become a good person before? 

Anyway, it didn't matter. 

Let the past be bygone! 

"Then, what should we do now...?" 

Kagaya sighed helplessly, thinking about what they should do. After all, Muzan had run away, so what could they do to search for him?

"Well, look at the good point; if I could defeat it once, then I could defeat it twice," Isao said, trying to cheer Kagaya up as any good guy would. 

"....." Everyone. 

Kagaya blinked his eyes as he looked at Isao before he nodded. "You are right." Still, even so, to defeat Muzan, they had to search for this cowardly thing first, but then a thought crossed his mind. Still, he shook his head, then asked, "By the way, why did you go to that village to meet this boy?" 

"Oh, I am searching for the remnant of the original breathing." 

"Oh..." Kagaya nodded, but then, his eyes widened. "What?" 

"What?!" 

Others were also dumbfounded, including Kanae, Hinatsuru, Makio, Suma, Shinobu, and everyone else. 

"You mean... that strange dance this guy did before was "Sun Breathing?" Shinobu asked speechlessly. 

"Yup." Isao nodded, then asked, "Tanjiro, show everyone." 

"O-Okay." Tanjiro nodded and quickly showed the dance of the "Sun Breathing." 

Yup, dancing. 

The movement of the original breathing, the "Sun Breathing," was like this, and it appeared so beautiful that it could be used as a dance. 

Still, Tanjiro didn't know what kind of treasure he showed of everyone as no one explained to him what the "Sun Breathing" was. 

However, all of the people present were in a daze as they didn't expect the boy, who had made Isao lose his chance to slay Muzan, their biggest enemy, to be the descendant of the strongest Demon Slayer. 

"...is he the descendant of Yoriichi Tsugikuni?" Kagaya asked quietly while observing Tanjiro's dance with his blurry eyes. 

"No, it should be that Yoriichi Tsugikuni taught Tanjiro's ancestor the "Sun Breathing," but as Tanjiro's ancestors didn't have much talent, the current "Sun Breathing" became a dance." 

Well, this should be the case, but as Tanjiro was the protagonist, everything was possible. 

"I see... that's a shame." Even so, it was still great that they could get the trace of the "Sun Breathing," but at the same time, the "Sun Breathing" wasn't that necessary since Isao could take down Muzan with "Insect Breathing." 

Still—

"What do you plan to do with him?" Kagaya asked. 

"You can do whatever you want with him." Isao rolled his eyes, ignoring Kagaya's intention, who wanted to recruit Tanjiro to the Demon Slayer Corps. 

"Thank you." Unlike the others, who couldn't see through him, Kagaya was sure that Isao could see the ugliness of his heart. Like his face, which became ugly due to his disease, his heart also became ugly with it. Yet, it didn't matter since Isao could accept him and even let him do whatever he wished as long as he didn't harm Isao and those he cared about. 

Frankly, compared to all the Hashira, who was so loyal to him, Kagaya felt that he was closer to Isao. 

Yet, this was normal since all the Hashira and all the Demon Slayer Members had always thought of him as a father figure, someone they had to follow and worshipped, but Isao treated him like any other people, which was why they were closer than any.

At the same time, even if Isao knew this ugly heart of his, he was chill, so while Isao never thought so, Kagaya thought of him as a friend. 

Nevertheless, with Isao's permission, when Tanjiro finished, Kagaya started to recruit Tanjiro to become the Demon Slayer, and as expected, Tanjiro accepted Kagaya's recruitment without hesitation. 

Watching all of this, Isao thought that the dialogue between Tanjiro and Kagaya was like that RPG game where Tanjiro was the player or the protagonist, and Kagaya was the NPC who gave him a mission. 

"Don't yawn." Shinobu quietly glanced at Isao. 

Isao, who was caught, rolled his eyes, but he didn't say anything. Still, if someone asked why he didn't stop Kagaya, it was because he knew that it was impossible to stop Tanjiro. 

It might be the work of destiny and fate, but Tanjiro would become the Demon Slayer no matter what. 

Still, even if it wasn't the work of fate except for being a Demon Slayer, there was hardly anything that Tanjiro could do, especially when he had no education, connections, or good parents. 

The demon might be cruel, but the world was even crueler. 

At the same time, he thought that the problem of a demon was much cuter than the problem in this world. 

Nevertheless, Isao was glad that he had the system. 

Still, as Tanjiro accepted and became the Demon Slayer, there was one big problem. 

"Which "Breathing Style" should I let him learn?" Kagaya asked Isao, wondering what kind of "Breathing Style" Tanjiro should learn. 

Tanjiro might have the "Sun Breathing," but it was incomplete, and to complete it, he had to learn another "Breathing Style" first." 

The others also looked at Isao since if Tokita was a genius, Isao was a monster. 

Isao could easily teach everyone if he wished to, but everyone knew that this was unrealistic, especially when they knew how he was often busy with his business, and he also impregnated many women. More importantly, if something didn't catch his interest, he would hardly move. 

While Isao was the best example of the perfect warrior of the Demon Slayer, he was also the worst example of the Demon Slayer. 

Still, it didn't change the fact that Isao was reliable. 

Isao looked at the other strangely, realizing the plot had changed, but then again, as he had come, the plot had already changed so much that it was impossible to tell what would happen soon, especially when all of them were quite chill when they knew Nezuko, Tanjiro's little sister, had become a demon. 

If it were in the original, all of them would have tried their hardest to kill Nezuko since no one believed that she wouldn't eat a human's flesh and blood. 

However, with Isao, it was different since as long as Isao was around, what could Nezuko do? 

Isao almost killed Muzan Kibutsuji, a feat that had only been done by the strongest Demon Slayer in history. Many might feel complex, but they knew that he was comparable to Yoriichi Tsugikuni.

However, the fact was like this since Isao was the second existence that could push Muzan Kibutsuji into a crisis. 

Still, Isao had to think about Tanjiro now, thinking about whom Tanjiro should learn from. 

In the original, Tanjiro met Tomioka, so he learned the "Water Breathing" style, but in the end, this breathing style was meaningless for Tanjiro, who had learned the "Sun Breathing" from an innate, blood, and protagonist halo. 

Moreover, instead of following the original, Isao felt that there was one person who was more suitable to teach Tanjiro. 

"Shinazugawa, go and teach him," Isao said while looking at the fierce-looking Wind Hashira.

"Ha?! Why should I?!" Sanemi subconsciously answered in a rude way. 

"Sanemi..." Kagaya looked at Sanemi helplessly. 

While Sanemi quickly bowed down when Kagaya looked at him, he was still stubborn and looked at Isao again, wondering why this bastard asked him to teach a burden?! 

Yes, Isao might be powerful and his position might be similar to Kagaya's, but even so, Sanemi wouldn't give up and tried to become stronger, so he could defeat Isao, yet somehow... he felt like it might be little too hard to do. 

Still, Isao didn't get angry at Sanemi's rude answer and just said, "His experience is quite similar to yours, so learning under you will be more beneficial for him." 

"...." 

When Isao gave his answer, everyone fell in silence and felt that there was nothing wrong with Isao's decision. 

Sanemi also no longer refused and looked at Tanjiro with a complicated gaze. After all, like Tanjiro, one of his family members had also turned into a demon, but unlike Tanjiro, who decided to protect Nezuko, he killed his mother, who had turned into a demon in the past. 

While Sanemi might not say anything, he had to admit that he was quite jealous of Tanjiro, who could meet Isao and save his family, but even so, it didn't mean he had a small heart and wished to release all of his frustration on Tanjiro. Instead, when he heard Isao's answer, he thought that there was no more suitable person to teach Tanjiro than him. 

Not in the breathing style, but as someone who had their family become a demon. 

"Tanjiro, learn under Shinazugawa well," Isao said. 

"I will!" Tanjiro bowed his head at Isao, then bowed his head at Sanemi. "Please take care of me, Sensei!" 

Sanemi snorted and said, "I am not your teacher, but I will train you so hard that you wish to die! I won't give you a moment of rest; you will have to—" 

"I WILL DO MY BEST!!!" 

"....." 

Sanemi's lips twitched, thinking that he was going to train Tanjiro well so that Tanjiro wouldn't have the energy to talk so rudely like this. 

At the same time, watching their interaction, Isao wondered whether the canon had started.

After all, the story starts when Tanjiro becomes the Demon Slayer, and as he becomes one, the original plot should have started. 

'Now, what should I do?' 

Isao looked at Kanae, who sat by his side. She had always shown a gentle smile, rubbing her belly softly with affection and anticipation.

"Hmm? What's wrong?" 

Kanae looked at Isao curiously. 

Isao thought that he had decided to rest first.