Ultimate Being from the Tokonosu City

Love Breathing. 

This was the breathing style created specially by Kanroji from the "Flame Breathing" to suit her style. 

The core of this breathing style was to utilize superhuman flexibility, dexterity, and agility to perform wide, winding, and weaving slashes that have mid-to-long range applications. 

"Baam! Swoosh! Swish! Like that!" 

As Kanroji performed her "Love Breathing" while giving a sound effect with her own voice, Isao watched all of this in silence.

This young woman was a genius, he thought. 

Unlike him, who copied from the others, Kanroji developed her own style. 

Yet, Isao only cared a little about originality since, in his mind, as long as it could defeat his enemy, be effective, and be easy to use, then it was all fine. Even the original protagonist also used the original breathing style, the "Sun Breathing," something created by the creator of the breathing style instead of creating his own style. 

Frankly, Isao thought that he might as well defeat his enemy in a single strike, killing it instantly rather than fighting for three days and three nights, giving a cool gimmick. 

In his mind, a fight had to be done in an instant. 

In a single moment, everything was decided whether you would die or win. 

Fortunately, Isao had won many times, and if he couldn't win, he would run away and return when he had a chance to win. 

In other words, he had always been the winner! 

A word of defeat had never been in his vocabulary, and victory was something natural for him. 

Yet, he had to say, Kanroji's breathing style was suitable for him, too, especially when his flexibility was also one of his strongest traits, especially after he gained the DNA of an octopus. 

Yup, that animal that usually appeared in the hentai manga.

While it was surprising, an octopus was the most flexible animal, and it also made his body so flexible that he knew that people might find him disgusting when he tried to show how flexible he was. 

"You need to strengthen the strength of your waist and move your entire body as if it were a single entity, then snap your sword at that moment." 

"Ah, I see! I will do that! Baam! Boom! Swish!" 

"..." Isao. 

Watching how Kanroji started to show progress on her "Love Breathing," Isao was glad that he had gotten Saeko's DNA, which gave him a talent for swordsmanship. 

'When I go back, I will comfort her a lot,' he thought. 

Still, Isao wondered whether he could obtain the DNA of Yoriichi Tsugikuni, the creator of the original breathing style. 

If possible, he wanted to get the DNA of this guy as it would make him stronger, but this person had passed away, and it had been hundreds of years since he had passed away. 

If he could find the grave, it would all be fine, but unfortunately, he couldn't, which made him helpless. 

Frankly, Isao tried to develop a new technique for tracking down DNA to its ancestor DNA. However, it was too hard, and there were so many variables that made it difficult. 

However, if he was successful, he would also get the DNA of the dinosaurs if he obtained the DNA of a crocodile, as crocodiles were the most closely related group of dinosaurs. 

Moreover, if he could develop this ability, even if he didn't have Muzan's DNA, he should be able to get Muzan's DNA by tracking the DNA of Doma, Akaza, Gyutaro, and Daki. 

Unfortunately, he couldn't. 

So, his only chance was either to obtain the protagonist's DNA or the DNA of Upper-Rank One, Kokushibo, who was Yoriichi Tsugikuni's blood brother.

"Isao-kun! Isao-kun! I did it!" 

Suddenly, his thought was interrupted by Kanroji's excited voice as she completed one of her techniques. 

"Congratulations, Mitsuri." 

"It's all because of you! Thank you, Isao-kun!" 

Naturally, as they trained together, their relationship became closer, and at the same time, while he knew the reason, Isao couldn't help but ask, "By the way, Mitsuri, can I ask you something?" 

"Hmm? What's wrong? You can ask me anything!" Kanroji patted her chest as if showing how reliable she was, but instead, it caused her large chest to tremble in a lewd way. 

Isao glanced at her chest for a while before looking at Kanroji's eyes as he asked curiously, "Why did you join the Demon Slayer Corps? You don't feel much hatred toward the demon, right?" 

Kanroji smiled and asked with a slight teasing tone, "Are you worried about me, Isao-kun?" 

"Yeah, you are a cute girl, after all. What if you are hurt?" 

Kanroji blushed and became shy. "C-Cute? B-But I am not..." 

"No, you are cute. The cutest. I assure you that you are cute!" 

The words that came out from Isao were like a machine gun; it was unstoppable, and Kanroji, who didn't have such a powerful defense, was riddled and succumbed as her face turned as red as a boiled crab and smoke emitted from her body. 

'Wait, is that real smoke?' 

Isao was dumbfounded, but Kanroji was so shy. "G-Geez, Isao-kun, you shouldn't lie to me like that... I-I am not cute..." Still, even if Isao had said all of that, she didn't believe that she was cute, especially when she thought about how many men told her that she didn't deserve to be their wives. 

"No, you are cute. Believe me." 

This time, unlike before, the words that came out of his mouth were so sincere. 

While Kanroji was embarrassed, the smile on her face was so sweet. "T-Thank you. I-I am happy to hear that since it is my first time hearing someone praise me for being cute, even if it's only to make me happy." 

"Then, they are blind since they can see how cute and beautiful you are, and I never lie. I am only telling the truth." 

While it was true that he often lied as he breathed, he didn't lie to Kanroji. 

Yes, Kanroji might not be as beautiful as Saeko or Kanae, but her gentle heart and soft chest made her appear charming. 

"P-Please stop... M-My heart won't bear it if you keep praising me like that, Isao-kun..." 

"Then, you should get used to it since I will say that to you so you will have more confidence in yourselves." 

Kanroji blushed once again and was completely vulnerable under the bombardment of Isao's fierce attack. "Geez... even though you are taken... why did you make me like this..." Her voice was quiet, but it was natural that it couldn't be hidden from Isao, whose sense of hearing was as sharp as a bat.

"Did you say something?" 

"No-Nothing!" 

"Really?" 

"Really!" Kanroji said with all of her might, and at the same time, she was completely panicked. 

Still, Isao didn't intend to pursue this matter, and as he often said, such a gentle young girl shouldn't be with him. 

Yes, he was kind and gentle, but he was about to become a father, so he should control himself. 

At the same time, he realized how much he had changed, thinking that a bastard who played with the life of people like a toy had grown up, which made him quite emotional, and he felt that his journey was eventful. 

Yet, when he showed such a melancholy expression, Kanroji couldn't look away and wished to hug him tightly in her arms, comforting him with all of her might. 

"Okay, how about we train more?" 

"Yes!" 

As the two trained together and became closer, in the distance, in a deserted place where no one would come, a certain someone felt his nose was itchy. 

"Achoo!" 

"What's wrong, Iguro? Did you catch a cold?" Rengoku asked loudly. 

"No, I am fine, Rengoku-san." Iguro shook his head, but he felt something important flew so far away from himself. Yet he shook his head, thinking that he should focus on the eradication of the demon and bring the world into peace.