Chainsaw Man: Mangekyo Sharingan

Chapter 75: Chapter 75: Congenital Heart Disease

"Go to the hospital? Doesn’t that cost a ton of money?"

Denji honestly did not want to cause Kotone any more trouble.

"That’s nothing to worry about. Besides, I’m a Devil Hunter. You don’t need to worry about the money. Being able to live properly is what matters most," Kotone Asaba said.

Treating this kind of illness might be difficult for an ordinary person, but as a Devil Hunter, he could make large sums of money very quickly, and he already had several million yen on him. The only thing he cared about now was how severe Denji’s heart disease had become, and whether it could still be cured.

Denji did not know what to say for a moment. He felt deeply grateful to Kotone, and also a little guilty. Kotone had already helped him so much and spent plenty of money on him. Now, taking him to get treated would be another unimaginably huge expense.

[Denji Affinity +10%]

[Denji’s Affinity progress has reached 90%. Achievement reward obtained: Constitution +1]

Right now, Kotone had no time to care about Affinity. He immediately prepared to take Denji to the hospital for an examination.

"Close your eyes for a second. Don’t get scared."

Kotone reminded Denji first.

"Okay."

Denji closed his eyes.

Then Kotone brought Denji into the Kamui dimension with him.

He did not have the "coordinates" for any nearby hospitals, so he planned to take Denji straight to the hospital used by Tokyo Public Safety.

That hospital could be considered one of Tokyo’s famous major hospitals. Its medical conditions were top-tier, and after Tokyo Public Safety Devil Hunters were injured, they usually received treatment there.

Of course, Tokyo Public Safety’s own medical capabilities were not bad either. In fact, they were rather extreme, because they relied on devil power and were specifically used to deal with more unusual and troublesome injuries, such as severed arms and legs.

They could quickly reattach severed limbs, and recovery was also very fast.

As for ordinary injuries, those were still treated at the hospital. Relying on devil power naturally came with a price. Frequent use would be unbearable, so it was only aimed at special injuries.

The next moment, Kotone and Denji appeared in front of the hospital building.

There was no need to line up at all. Public Safety Devil Hunters had the highest priority.

Kotone showed his Public Safety Devil Hunter ID, and Denji was immediately examined.

A complete heart examination took quite a while, but Kotone waited patiently in the hospital.

There should not be any problems with Reze and Kobeni, so he was in no hurry to head over there. He would deal with Denji’s matter first.

However, while he was waiting, Kotone’s phone suddenly rang. He looked and saw that it was Reze calling.

"Hello? Reze, is something wrong?"

"Nothing happened. I just wanted to know where you ran off to. Why haven’t you come back after so long?"

"I brought a kid to the hospital for an examination. He’s kind of like an important little brother to me. I’ll come back after I finish dealing with this."

"Oh, okay. Then there’s no rush. Take care of that first."

"By the way, how are you and Kobeni getting along?"

"We’re having a great time. Right, Kobeni?"

It seemed Kobeni Higashiyama was right beside Reze.

"Y-yes."

Kobeni Higashiyama’s voice soon came through.

"Kobeni is so cute. I wish she could be my little sister."

"Huh?!"

Kobeni Higashiyama let out a small cry, as if Reze had suddenly hugged her.

From the sound of it, there really did not seem to be any problem, which surprised Kotone a little. He had not expected Reze to get along well with Kobeni.

He had originally been worried that a romantic disaster might break out. Though he did not know whether what he heard over the phone was only an illusion.

After a long while, Denji’s examination results came out.

The doctor said to Kotone with a serious expression, "You’re his family, right? His condition isn’t very optimistic. His congenital heart disease is already in its late stage. Is there a family history of inherited illness? And for it to already be late-stage at such a young age is very rare..."

"Yes. His mother also had heart disease, so it should be hereditary," Kotone replied.

As for why it had reached the late stage at such a young age, that was probably related to Denji’s previous living conditions. He had never eaten enough or slept warmly, had been mentally oppressed every day, and had suffered domestic abuse.

It was only recently that Denji’s body had clearly become much healthier. When Kotone first met Denji, he had been nothing but skin and bones.

"So what should we do next?"

Kotone immediately asked.

"Given his current condition, medication can only relieve the symptoms. With drug treatment, he should be able to live into his twenties."

"There is also the option of heart transplant surgery, but that is not exactly a good solution either. At present, the success rate for heart transplant surgery is not high, and the cost is extremely expensive. Even if it succeeds, it would only let him live a few more years."

"In short, it depends a lot on luck. With good luck, the surgery succeeds, and with good luck, he lives longer."

After hearing the doctor’s words, Kotone basically understood.

Denji’s lifespan was more or less limited to his twenties or thirties at most, and that was under the condition that drug treatment was taken to the limit and the heart transplant surgery succeeded.

In this era, heart transplant surgery was indeed still immature. The expensive cost was a minor issue. The main problem was the low success rate, so it could only be saved as a final hope to extend his life.

"Then we’ll start with medication first," Kotone said.

Denji was beside them, listening to Kotone’s conversation with the doctor. He understood too. He understood that he would not live many more years.

But he did not feel particularly pessimistic. After all, if not for Kotone, never mind living into his twenties, he would already be dead.

All he felt was guilt. Drug treatment definitely cost a lot of money, and the doctor had even directly said that heart transplant surgery was extremely expensive.

After that, Kotone took the prescription the doctor had written and went to get the medicine. The cost of the medicine was nothing to him.

After getting the medicine, he taught Denji how to take it, then brought Denji home.

"Don’t think too much. You only need to take the medicine on time. You can live normally. Believe me, I’ll find a way to solve this."

Kotone stroked Denji’s head and comforted him.

"Okay."

Denji obediently nodded.

From beginning to end, he did not cry or make a fuss. He stayed very quiet, doing his best not to add to Kotone’s worries.

[Denji Affinity +5%]

[Denji’s Affinity progress has reached 100%. Achievement reward obtained: Constitution +1. Extra reward obtained: Constitution +5!]

Before today, Denji’s Affinity had already reached eighty-five percent. It rose by ten percent before going to the hospital, and now it had risen by another five percent, so his Affinity was already maxed out.

As expected, Kotone also received the extra reward of five Constitution points.

"Then I’ll get going first."

After finishing everything he wanted to say, Kotone prepared to leave.

In truth, aside from the treatment methods the doctor mentioned, he had an even better method, one that could directly cure Denji’s heart disease at the root.

That was to let Denji fuse with a devil heart and become an immortal Hybrid. Heart disease would no longer matter at all.

Speaking of which, this was similar to heart transplant surgery. The only difference was that the transplanted heart would be a devil’s heart. The success rate would definitely be even lower than ordinary heart transplant surgery.

Also, transplanting a devil heart was not something an ordinary person could do. They would have to go to the secret lab used by the Soviet military to conduct experiments in that area.

As for whether other countries had this technology, he was not sure, but there was no need to look for other countries. The Soviet military happened to be under Kotone’s control.

However, aside from that, if a devil heart voluntarily fused with a human, then there was no need for technology or experiments at all. Under the condition that the devil heart was willing, the success rate of fusion was one hundred percent.

Just like in the original story, when Pochita willingly became Denji’s "heart," it succeeded instantly because Pochita did not resist at all.

But the current situation was different. Kotone had come to this world and changed the trajectory of Denji and Pochita’s lives. Right now, Pochita and Denji had neither formed a contract nor become especially close. If he wanted Pochita to fuse with Denji, he could only force Pochita to do it.

He definitely did not want to force Pochita. Pochita was also very important to him. Besides, he had enough confidence in the Soviet military side.

There should still be remaining devil hearts on the Soviet military’s side, such as the Katana Devil’s heart. When the time came, he could use genjutsu to control the Katana Devil’s heart first and make it willingly become Denji’s "heart." That way, there would be no issue.

So now, he needed to go discuss this matter with Reze first.

Kotone transferred himself back to Reze and Kobeni.

He could see Reze reading a book in Kobeni’s room. What she was reading was one of Kobeni’s high school textbooks, and she seemed quite interested in it.

Kotone also remembered that Reze had never gone to school. Perhaps she yearned for school life a little.

"You’re finally back. How’s that kid you mentioned?"

As soon as Kotone arrived, Reze noticed him.

"The situation isn’t very optimistic..."

Then Kotone lowered his voice. "Come outside for a moment. I want to talk to you about Hybrids."

Kobeni Higashiyama seemed to be in the bathroom, so she would not hear what he said in such a low voice.

Hybrid matters were not convenient for Kobeni to know about, so he wanted to talk to Reze in private.

It was not that he was deliberately hiding things from Kobeni, but some things were better left unknown.

Reze did not say anything more. She put Kobeni’s textbook back where it had been, then followed Kotone out of Kobeni’s room.

Sitting in the living room, Kotone controlled his volume and asked Reze, "On the Soviet military side, how many devil hearts are there that haven’t led to successful experiments yet?"

"There should still be two, but I don’t know their specific names. Why are you suddenly asking about that?"

Reze was a little confused.

"Denji’s heart disease is already in its late stage. Whether it’s medication or heart transplant surgery, they can only barely extend his life. That’s why I want him to fuse with a devil heart and become a Hybrid."

Kotone stated his intention.

Reze’s expression immediately showed a hint of surprise. "The success rate for transplanting a devil heart is extremely low. Out of a group of children, only a few can succeed..."

She was one of the experiment subjects who had personally experienced it, so she knew very well how low the success rate for devil heart transplants was.

"You don’t need to worry about that. I have a way to solve it. If there are still two, I’ll go take a look when the time comes."

Kotone had already made his decision.

One of those two devil hearts should be the Katana Devil. Reze did not know their names because they had all been eaten by Pochita in Hell before. They were special devils whose names were gone, yet who could still exist. The Soviet military could only refer to those devils by nicknames.

Speaking of which, there was a continuity error in the original story. At the end, when Makima controlled the seven Hybrids to battle Pochita in his black Chainsaw form, it was clearly stated that the devils inside those Hybrids had all been eaten by Pochita. Their names were gone, yet for some unknown reason, they still existed.

But earlier, Kishibe and the others knew that Daiki Hamano was Katana. It was probably an accidental conflict between earlier and later settings.

However, Kotone was not in a rush to immediately take Denji to the Soviet military. Denji’s current condition was not critical. With medication, he could still live normally for several years, so there was no harm in waiting for a while.

According to the timeline, summer vacation would arrive very soon. He could take Denji to the Soviet military during summer vacation. The process might be rather troublesome then, and probably would not be resolved quickly.

It was not as if he could simply make the military higher-ups under his genjutsu give an order and directly obtain a devil heart.

That was the same reason he could not interfere too much with the Soviet military. Other eyes were watching. If the few people under his control behaved too strangely, it would definitely arouse suspicion.

At most, he could have those people appropriately open a back door for him, then he and Denji could enter that secret lab, follow the necessary procedures, and everything would be fine.

"Good. As long as you have a way to solve it," Reze said.

Reze had roughly realized what method Kotone would use.

That secret lab had researched this for so many years, so of course they knew whether the experiment succeeded mainly depended on the devil heart’s mood. For example, if the devil heart found a test subject pleasing, the chance of success would be high. If not, the experiment could easily fail.

And with Koto’s ability, he could probably directly control the devil heart and forcibly make it fuse with that boy named Denji. That way, there would be no real risk.

"By the way, what do you plan to do next? Become a Public Safety Devil Hunter? Or something else?"

Kotone suddenly brought up that topic.

"Koto is still going to work as a Devil Hunter for Tokyo Public Safety afterward, right? Then I’ll come too," Reze said casually.

"Don’t you want to go to school? You seemed pretty interested in Kobeni’s textbooks just now. You’ve probably never gone to school before, right?"

Kotone asked.

"Yeah. I’ve never gone to school before, but I learned everything I needed to learn in the military."

Reze said, "Compared to going to school, I’d rather stay with Koto."

Just then, Kobeni Higashiyama came out of the bathroom. When she did not see Reze, she walked out of the room and found Reze sitting on the sofa in the living room. Kotone had also returned.

"You’re back, Asaba. Is the child you took to the hospital okay?"

Kobeni Higashiyama also showed concern for Denji’s condition.

"Don’t worry. It’s nothing serious. There’s a way to cure him," Kotone answered.

"That’s good. Then... when are you and Reze going back?"

"Reze?"

Kotone could not help glancing at Reze.

"I asked Kobeni to call me that."

Reze explained with a faint smile.

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