Start by Eating Jake Jake no Mi

While Hiromi, Airi, and Shiori came to Tokyo, Masa didn't plan to bring them to Tokyo but to the nearby city, Yokohama. It might be strange for him to bring them to the other city as they had arrived in Tokyo, but this wasn't their first time in Tokyo, and they had been to many places before. 

All of them might have originated from Kanazawa, yet even so, they weren't country bumpkins who had never gone to Tokyo. 

Instead, it was because they knew Tokyo well that they didn't plan to go there as they felt bored, considering there wasn't much difference between this city and other metropolitan cities. 

Department stores, skyscrapers, and many other similar places lacked a distinctive and originality.

On the other hand, while Yokohama was quite similar, this place was quite special as it was the biggest Chinatown in Asia. Naturally, this was their destination, and they had fun with all of their might as they would be apart once again after they finished this trip. 

Five days or so. 

It might even be longer, and because of this, when they thought of the time they parted, they sighed, but somehow, this was also a spice in their relationship since, as they parted, it made their meeting sweeter and more meaningful. 

However, next time, Airi felt that she should come to Tokyo by herself when there were no Shiori and Hiromi, as the two of them made it hard for her to have an intimate exchange with Masa. 

"Oh, you are driving a car?" 

It was just that Shiori was surprised when she saw Masa driving his own car. 

How old is Masa again? 

Could he even get a driving license? 

"If you have money, everything is possible." 

It's the same in any place; as long as you have money, everything is possible. 

Masa hadn't reached the age where he could get a driver's license for a car, but even so, there were many ways for him to get it. 

Nevertheless, Shiori rolled her eyes and didn't say much, even if the role of a private vehicle wasn't as important as before, considering how advanced the transportation development was, it surprised her when Airi sat by her side on the back seat, giving up the seat next to Masa.

"...you have grown up." 

"I am the big sister, after all." 

Yup, a big sister-in-law. 

The one who would marry Masa was Airi, and this fact didn't change, making many, especially those close to him, sigh helplessly. 

Regardless, Shiori and Hiromi quickly threw away these depressing thoughts as they wanted to enjoy this trip as much as possible and forget all the unpleasant problems! 

Still, somehow, as they talked, Hiromi couldn't help but ask, "Onii-sama, do you think immortality is possible?" 

This has become the talk of the people in the country lately, especially after their families learned a magic that made them youthful and better-looking. Many couldn't help but wonder whether magic allowed one to become immortal. 

While some people wanted to die as it was too painful to live, many wished to live forever, especially those who enjoyed their lives. 

Masa might have planned to create magic that allows one to prolong one's life, but then again, he didn't expect the impact to be so immense. 

Yet, this was also a great thing, especially when the anti-magic organization had been rampant and become more radical lately, so this talk was a great thing as it could show the importance of the magician to society.

Still, he had to answer this question first, so after he appeared to be in deep thought, he nodded. "It is possible." 

"...." Hiromi, Airi, and Shiori. 

"In the Great Asian Union, there should be an immortal." 

"Huh? Really?" 3x

They might have heard a myth or a legend about an immortal in China, yet even so, despite the existence of magic, it was hard for them to believe in such a myth or a legend, but when Masa said so, they knew that it really existed. 

"Yeah, they are like Chinese zombies you see in the movie, though." 

"....." 3x

Watching their expressions, Masa smiled, but he wasn't wrong since there were many types of immortality, whether it was by injecting their memories into the next descendants, becoming data within the computer, or even becoming a corpse-like existence that was awoken by the necromancer. 

In the description, immortality is when someone is living when they are supposed to die, so those he mentioned above should be included, right? 

After all, even if their forms were different, they were immortal. 

Yet, he also knew that the immortality that his little sister asked about wasn't something that he had mentioned before. 

"While I want to say yes, it is hard, especially when we reach a certain period in our lives when our cells will stop dividing as our DNA is damaged." 

When cells stop dividing, in a few days, people would die, but on the other hand, if cells continued to divide, then we would live forever until the cells stopped dividing. 

The key to immortality was to make the cells continue to divide, and this was why Asuha previously asked him whether his magic could control telomeres since, without them, cells would stop dividing and eventually die.

"Then, if we can control these telomeres, we can achieve immortality, right?" 

"If it's that easy, then it is good, but if we manipulate the telomeres, a mutation will naturally happen on our DNA, and by then, our entire bodies might be riddled with cancers." Masa shuddered as he said, "Can you imagine having your head to toes covered in cancer?" 

"—?!" 3x

The three girls shuddered with fear and disgust as they imagined themselves covered in cancer. With the advances in medical technology, it was easy to treat cancer, but then again, cancer wasn't like a small disease like a simple flu. 

Yet, there was no doubt that the key to immortality could be found within the cancer cells since the cancer cells were immortal. 

However, if the price of immortality was being haunted by this disease forever and ever, wouldn't it be better to die, then? 

Prolonging life was possible for him, and Masa could do it easily if he wished to with magic, but for immortality unless he could create an Evil Piece from the world of DxD to this world, then it might be hard. 

"There is a jellyfish that can live forever or be immortal, and many even did a deep research on this creature, but—" 

"But?" 3x

"The chance is small since our body is different from a jellyfish, and unlike a jellyfish, we can't return to our youth." 

The way this jellyfish became immortal was by reversing their biological cycle. 

If Masa had to say, it was like a chicken could become an egg when it was about to die, or an elderly person could become a baby when they were about to die. 

Unless one could perfectly control their bodies down to their atoms or have time control, such a method was impossible. 

Yet, even if magic was an amazing thing, once again, it couldn't escape the law of physics, and it could be mimicked by technology.

If Masa had to say, magic is the ability to bring about what is possible through science with supernatural means; although the process is considered a miracle, the result is not.

This is why magicians were called "sham," and many anti-magic organizations arose since if science can do it, then why is a magician needed? 

'Unless one can control something that is impossible to be controlled by science.' 

So, as long as a magician was limited by the laws of physics, in the eyes of others, their existence would always be treated as a weapon. 

Still, let's talk about this problem later since, for immortality, besides the body, there was one other factor that one needed to control, or else everything was meaningless, and this was also one thing that could make people change the impression of a magician and probably be seen as a god.