Ultimate Being from the Tokonosu City

Still, Isao didn't bother with Tanjiro any longer and decided to digest all of his gains. 

Tanjiro's DNA was amazing, but Muzan's DNA was even more impressive! 

At the same time, Isao wondered whether he should go back to the world of the "High School of the Dead" since all the value in this world had been squeezed by him. The value of this world was like a squeezed orange for him. No juice remained, and what was left was only the skin of the orange, which was pretty useless. 

Oh, well, it could be used as a garnish, but there was no doubt he had become more powerful after he devoured Muzan's DNA. 

Yes, he might not have absorbed all of Muzan's body parts, but he had absorbed most of them, especially when Muzan kept regenerating his body, giving him a lot of his flesh. 

Frankly, it was a bit disgusting, but no matter what, he became stronger. 

However, before he explained what he had gained, he had to calm down many who came in his direction. 

"Isao-kun!" 

"Isao, are you okay? How is your body?" 

Even though Isao might have had the upper hand in his previous confrontation, his body was all bloody due to whip-like Muzan's body parts. Moreover, those body parts had thorns like a rose, so whenever they had an exchange, Muzan's thorns would wound his body.

Isao was able to regenerate all of those wounds, but he wouldn't be seen as a human if he dared to do so. 

Still, watching his bloody body and how Isao lay on the ground exhaustedly, no one could maintain their calm, especially the invincible image that Isao had always imprinted on his mind. 

This demon, who could do all of this to Isao, definitely wasn't an ordinary demon. 

Fortunately, Isao had defeated this demon, but—

"Don't let your guard down. That demon isn't dead yet." 

"—?!" 

"Shinobu, go to those victims. Check their wounds." 

"Ye-Yes!" Shinobu was startled, but she quickly reacted. 

"Mitsuri, stay with me. Try to see whether the demon is still around."

"Ye-Yes!" Kanroji took out her whip-like katana as she looked around cautiously. 

Still, Shinobu didn't leave immediately but asked, "How are you? Are you fine?" If something happened to Isao, then she definitely couldn't forgive herself! 

"I am fine. It is all just skin wounds. More importantly, check whether someone is still alive or not." 

"Okay, I will be quick. I will tend to your wounds soon!" 

Frankly, Shinobu didn't really like Tanjiro, especially when this boy dared to interrupt Isao's battle. If Tanjiro hadn't made such a sudden act like that, would Isao have been hurt like this? Still, even if she didn't like Tanjiro, it didn't stop her from checking Tanjiro's family's health since protecting civilians was something that a Demon Slayer had to do. 

So, with all of that, the group divided into two. 

One was to protect Shinobu, who tended to the victims, and the other was to check the surroundings to see whether the demon was still around or not. 

Still, with all that, Isao had some quiet time, allowing him to check his gains from Muzan's DNA. 

Nevertheless, the DNA of the demon was all the same since it gave him powerful regeneration, almost unlimited stamina, and powerful physical ability. 

If there was a difference, the quality of Muzan's body as the progenitor was much better than the others. 

Moreover, as he had become the progenitor of the demon, Isao also gained the ability to use the Kibutsuji's Curse, which allowed him to kill any demon with just a single thought in his mind. At the same time, he could also create a demon too. 

Lastly, Isao could also use Muzan's special ability, which was biokinesis. 

Unlike Doma, who could manipulate ice, Gyutaro, who could manipulate blood, or Akaza, who could manipulate pressure, Muzan's ability was simple, and that was to manipulate his own body at will. Whether it was shapeshifting, turning it into a blade, or even a monster was possible with this ability. 

Still, Isao had to say that this ability was quite lukewarm. 

However, this ability worked well for him, especially when his ability was mostly related to his own body. 

Frankly, the other demons also had similar abilities, manipulating their bodies to a certain extent, but the precision and speed that came from Muzan's ability were on different levels. If the other demon was a turtle, then Muzan was a cheetah. 

This showed how powerful Muzan's biokinesis ability was. 

Still, the best gain of devouring Muzan's DNA was to allow him to manipulate all the demons. 

While Muzan might be able to control all the demons, he couldn't control them at will. 

However, Isao was different, especially when he had the ability to control all the beings whose DNA was recorded inside him. 

Yes, he might be able to control the demon after he devoured his first demon, Doma, but Doma was just an upper rank, and a demon had a strict hierarchy position. 

Even though he could control all the demons under Doma's position, he couldn't control those above Doma. 

However, that weakness disappeared after he devoured Muzan's DNA. 

This was also why, even though Muzan had run away, Isao wasn't in a hurry and could even rest on the ground, checking his gains from Muzan's DNA like this. 

At the same time, Isao was a bit disappointed because even though he had devoured Muzan's DNA, he couldn't automatically take the DNA of all demons under Muzan. 

Moreover, instead of Muzan's DNA, the DNA that Isao wished to get the most was Biwa Demon's DNA. 

Yes, Muzan might be powerful, but Biwa Demon's ability was amazing. 

Infinity Castle.

This was Biwa Demon's ability to control endlessly large extra-dimensional space in the form of a Japanese castle. 

If there was a reason why Muzan could run away, it was due to Biwa Demon's ability, which made her able to open a portal that connected to the Infinity Castle in any place as long as she thought of. 

If Isao had this ability, he could do anything, such as stealing the nuclear bombs in the world of the "High School of the Dead," collecting rare resources in many worlds, and many other things! 

Moreover, the consumption of using this ability was also quite minimal, which was great. 

Oh, right, there was also Kokushibo, who should know where the corpse of his older brother was, the strongest Demon Slayer, Yoriichi Tsugikuni. At the same time, the ability of the remaining Upper Rank wasn't bad at all, and he also wished to get them. 

Or rather, Isao wished to get all the DNA of powerful demons, but he wasn't in a hurry, especially when he heard the commotion behind him. 

"Please! Don't kill my little sister! I will teach my family's secret technique! I will try to pay a lot of money! I will do anything! I beg you all!" 

Tanjiro's voice was so loud that it interrupted his break. 

Still, Isao, who pretended to rest, thought for a while and decided to help. Yes, this was troublesome and a pain in the ass, but as he had decided to become a good person, he knew that he had to help Tanjiro even though this guy's situation was so troublesome. 

"Ah, Isao-kun, don't stand up so suddenly! You are hurt!"

Kanroji was startled when Isao suddenly stood up, and she quickly helped him. 

"It's fine." 

However, Isao didn't pay attention to Kanroji, especially when he didn't believe Shinobu and the others could make a proper decision to handle Tanjiro and his family, so he knew he had to handle Tanjiro's problem by himself. 

Still, when he stood up and turned, his eyes happened to meet Tanjiro, and Tanjiro's eyes clearly showed hope. 

"....." 

Isao knew he might have said this before, but he realized that he was that "plot armor," which helped when the protagonist was in trouble.