This is improper

Unlike Isao, who felt conflicted when he learned the boy's identity, the boy was curious about this young man's identity. 

"Thank you..." 

Shiba Tatsuya said, then asked, "Are you a martial artist?" His voice was unlike that of a child; he had this maturity that is usually seen in children, but even so, his eyes and face were those of a boy. 

Still, Tatsuya was curious about this young man's identity. While he wasn't sure about Isao's age, it might be right to say that he should be in high school or his early 20s. 

Or might it be more? 

After all, even his mother and aunt appeared younger than their age. 

Nevertheless, it might have been his first time showing interest in someone, yet this was normal, especially when it was the first time he saw someone with such skilled fighting abilities. Moreover, he could tell that Isao never used magic, and everything was done with his physical ability. 

Whether it was his breathing, posture, or anything, it was impossible to see an opening in him. 

As it was his first time seeing someone like Isao, Tatsuya tried to use his "Elemental Sight" ability, which allowed him to see detailed information about anything down to the atoms. 

Yet, before he could use this ability, Isao flicked his forehead, and because of that, Tatsuya didn't dare to use it again, especially when he could tell that he wasn't Isao's opponent and didn't want to antagonize him, especially when he had to protect Miyuki. 

Who was he? 

While most of his emotions were erased, leaving only his love for his little sister, Tatsuya was a human, and he was different from a robot, where it was absolute. Sometimes, something known as a miracle existed, so while it should be impossible, he felt curious about this young man. 

"Martial artist? No." Isao yawned, then walked toward the fifty men that he had beaten up. "I am just a bum. Unemployed." While saying that, he took out all the wallets of those people and took out all of their money.

Even if some of them had woken up, they didn't even dare to say anything when Isao took their money. 

"...you did a crime," Tatsuya said speechlessly when he saw how skillful Isao was in taking out the money from the wallets of those people who tried to harm him. It was true that they tried to surround him and beat him, but Isao took all of their money as if it was something natural, he couldn't help but say. 

"I am not." Isao shook his head and said, "They have asked me for a lesson, and this is their tuition." He suddenly kicked one of those people and asked, "Right?" 

"Ye-Yes!" 

The man nodded obediently. 

"See?" Isao smiled at Tatsuya, causing the boy to look at him blankly. 

"Now, go," Isao said, then shooed them away. "I have collected the tuition, but if you feel unsatisfied, you can come to me again." 

"...." 

Fifty men, including Tatsuya, stared at Isao for a while before those fifty men quickly ran away while helping each other as their bodies were hurt. 

"Call more people. Don't forget to bring your wallets, or else you will go home naked." 

Hearing those words, all of them quickly moved faster. 

Isao looked at all the money in his hands and smiled, feeling melancholy and nostalgic about his old job when he was still a bad guy. However, he had changed, so he wouldn't do something so low, such as extorting money from someone. All of that money was tuition for their education so they could become a better person in the future. 

'Hopefully, they'll be able to call more people.' 

Still, Isao had to say that he was surprised that in 2092, there were still many who used cash. He thought that they would disappear, but then again, he felt that cash was impossible to disappear, especially when how easy it was to hide them. 

While Isao thought so, Tatsuya kept staring at Isao blankly. After all, it was his first time seeing someone admit that they were a bum or unemployed. Everyone wanted to appear cool or better than others, so they usually showed they were better, exaggerating their achievements, but this guy told him that he was a bum. 

Even if Tatsuya had hardly any emotions, he was speechless. 

"Then, boy, see you later. Just go home since you might be targeted if you are still here." 

Isao didn't really want to get involved with Tatsuya, the strongest in the world. Moreover, Tatsuya's family was hardly average, and many of them were even crazier than Tatsuya. Moreover, he had gained Tatsuya's DNA, so there was no need for him to do anything. 

As for the girl, naturally, he remembered. 

[You have acquired Shiba Miyuki's DNA.]

[Do you want to absorb it?]

Separating part of his body, Isao controlled it and touched Miyaki, who was still sleeping secretly. 

Yes, Tatsuya was the strongest man in the whole world, but he wasn't omnipotent. If he hadn't used his "Elemental Sight," it would have been impossible for him to notice what Isao did, as his senses and physical ability were just slightly better than normal humans without magic.

"Wait!" 

When Isao was about to leave, Tatsuya suddenly stopped him. "What's wrong, boy?" 

"I am not a boy. I have a name." Frankly, Tatsuya felt unhappy being called a "boy" by Isao as their age shouldn't be much different, right? "I have a name. My name is Shiba Tatsuya." 

"So, what's wrong, Tatsuya?" Isao asked lazily. 

"..." 

While Tatsuya was speechless, being called by his first name directly, he said firmly, "I have a job for you." 

"You have a job for me?" Isao looked at Tatsuya strangely. 

"Be my martial arts teacher. I will pay you well," Tatsuya said firmly, thinking that if he could learn under Isao, then he could be more powerful. 

While Tatsuya was the strongest, he was still a young man, after all, and like any other boy, he wished to become the strongest. 

Isao laughed, saying, "Come to me when you have your parents' permission." 

Hearing Isao's words, Tatsuya hesitated, realizing with his position, he knew that he had already crossed his limit, but even so—

"Wh-What's your name... sir?" 

While Isao might appear young, Tatsuya thought that Isao might be older than Isao appeared to be. 

"Iinuma Isao." 

As Isao said his name, he left and vanished from Tatsuya's sight. 

Tatsuya was surprised and tried to search for Isao, but he couldn't find him anywhere, which made him realize he might have underestimated Isao's strength. However, again, this also made him curious. "...who is he?" 

On the other hand, after Isao left Tatsuya, he quickly established his identity in this world. Using his second ability, he simply manipulated the people and easily established his legal identity. He quickly became a local since he knew that no one would try to search for his information, especially when he had moved away from Tatsuya, and frankly, he didn't want to get involved with this young man whose only emotion was his love toward his little sister. 

Still, after he finished creating his identity, he went on a solo trip, trying various local dishes before sitting on the bench and watching the sunset. 

While eating octopus rice, sata andagi, hirayaaichi, pork egg onigiri, Okinawa soba, a rare, unique flavor of cup noodles, and shaved ice, Isao wondered what he should do in this world. He had the DNA of the strongest and the smartest in this world, so why should he stay? 

Moreover, unlike those fifty men, even if Tatsuya was just a middle school student, he learned, and Isao understood many things from Tatsuya's DNA alone. At the same time, he had to admit that it felt strange, as he became the strongest so easily after he got Tatsuya's DNA. 

Everything was so easy that it made him strange, which made him wonder what he did in the world of "Danmachi" and "Kimetsu no Yaiba." 

'I should have come to this world earlier.' 

Still, he thought that there were many things that he could learn from this world, so it was too early for him to go back. 

"Iinuma-san!" 

Only Isao heard a familiar voice calling his name, so he turned and saw Tatsuya, but it seemed Tatsuya wasn't the only one. 

Just like before, Tatsuya's little sister was there, but she wasn't the only one who accompanied Tatsuya since there was also a beautiful woman in her mid-20s and—

When their eyes met, it seemed like there was an electricity current that sparked their bodies, causing their bodies to shiver, but Isao quickly looked away, thinking that he wasn't a bad person anymore and he couldn't make a move on the married woman, and the woman was the same as she knew how improper her gaze was as she was a wife and a mother, but after she noticed he also looked away, she became curious and put her gaze on him with a gaze that shouldn't be shown by a woman of her identity.