As a Blacksmith in the World of Jujutsu Kaisen

Chapter 109



A system that was simple, yet extremely flexible when used with the right strategy. Through that… I could store power, regulate its use, and in the end, healing Shoko was no longer something impossible, but merely a matter of time and precise calculation.

Of course, this Cursed Tool was not perfect. There were rules that could not be broken, because every tool I created always had laws that bound it—limits that could not be surpassed even by me as its creator, as if there were an invisible contract that had to be respected.

First—this tool could not bring the dead back to life. No matter how much energy was used, no matter how strong the desire, death remained an absolute end, something that could not be touched by any mechanism within it.

Second—the number of candies remained limited: three per day. It could not be forced, could not be increased. But in exchange… the effects of those candies were utterly absurd, as if all biological limits were forced to submit to an "ideal condition."

The candies were capable of curing all kinds of physical illnesses, regardless of their form—cancer, congenital paralysis, blindness, deafness, even the inability to speak—everything could be restored without exception, as if those conditions had never existed in the body's history to begin with.

It was as if the human body possessed a perfect "blueprint" within itself, and the candy forced the body to return to that ideal form, correcting every deviation shaped by time, genetics, or the accidents of life.

Errors could be corrected, damage erased, imperfections straightened—not only diseases, but all forms of biological irregularities that interfered with the body's normal function would be forced back into their optimal state.

A body that had been weak since birth, fragile bones, and underdeveloped muscles—everything could be repaired.

It was as if all those innate shortcomings were erased, then replaced with the best condition the body should have possessed since the beginning of life.

Even for those who had aged, the effect still worked—their bodies would gradually grow younger, though still within certain limits.

The change did not happen instantly. Illnesses faded little by little until they disappeared, the body strengthened from within, and physical condition gradually approached its peak, as if every part of the body were quietly repairing itself.

The process was smooth and gradual, almost unnoticeable at first—like a stream of water slowly eroding stone.

Yet precisely because of that, the result felt natural. The body seemed to return to its best condition without force, following a rhythm that suited itself.

Small changes continued to occur unnoticed—breathing felt lighter, movements more stable, and a body that had once been weak began to rise again, little by little.

In some cases, the results appeared miraculous—those who once struggled to stand began to move steadily.

Trembling legs found their balance, footing became more stable, hands regained their strength, fingers were no longer stiff, and a body that once felt heavy became lighter, as if a warm energy flowed once more through every part that had weakened.

Over time, the changes became more apparent—the body not only recovered, but developed into something stronger—even approaching the physical condition of a trained athlete.

Muscles formed with balanced proportions, dense but not excessive, stamina increased, allowing the body to move longer without tiring quickly, while coordination improved naturally.

For the sick, they were fully healed. For the weak, they reached the best physical condition of a normal human. And for the elderly, they regained a portion of their youth.

However, "becoming younger" did not mean time itself was reversed. What happened was a complete rejuvenation of the body—a restoration of biological condition to a more optimal point.

The body's cells became active again and divided healthily, metabolism increased, making the body more efficient in using energy.

Muscles that had loosened became firm again, fragile bones strengthened, and wrinkled skin gradually tightened, erasing the traces of aging little by little.

One's appearance did become much younger, but there were still limits.

The effect of the candy was not to turn back time, but to restore the body toward its optimal condition—as if granting a second chance, without violating the laws of nature.

All changes occurred in a steady and consistent manner, like a system operating with high precision to restore the body's balance.

For example, a fifty-year-old person would gradually come to look like they were twenty-five, with the transformation happening bit by bit every second, not instantly or abruptly.

The changes were not only visible, but also tangible—breathing became deeper, steps felt lighter, and the mind grew clearer, as if the fog that once clouded one's consciousness was slowly dissipating.

Loose skin tightened once more, fine lines faded until they disappeared, weakened muscles were filled with strength again, and eyes that had once dulled regained their shine, reflecting a life that seemed to be rekindled from within.

This effect was no mere coincidence—the candy was specifically designed to alter a person's physical age to half of their original age at the moment it was consumed, a transformation governed by a clear and measurable system, not a random phenomenon.

Thus, when a fifty-year-old consumed the candy, their body would naturally adjust toward an optimal state equivalent to that of a twenty-five-year-old.

This adjustment was neither painful nor disruptive; instead, it unfolded smoothly, as if the body were simply returning to the best version it had ever possessed. More interestingly, the effect did not stop there, but continued over time.

Aging still occurred as it should, but with a different pattern from that of ordinary humans.

As the person continued to live and eventually reached one hundred and fifty years of age—the maximum limit of the candy's effect—their physical appearance would only resemble that of a seventy-five-year-old. They would still age, but at a much slower and more controlled pace.

These numbers might seem simple on the surface, but they carried significant implications.

Twenty-five is half of fifty—the initial age at which the candy was consumed.

Then fifty becomes half of one hundred—the next phase of an extended life.

Until finally seventy-five becomes half of one hundred and fifty—the absolute limit that the effect cannot surpass.

It was as if a logical system was deeply embedded within the candy's mechanism, a balance that ensured its power remained within reasonable bounds, preventing it from becoming something truly uncontrollable.

That is why someone who had reached the age of one hundred and fifty would never appear older than seventy-five, no matter how long they continued to live beyond that point.

Time might continue to move forward, but its effect on the body had been locked within a certain limit.

All of this made one thing clear—the power of this candy was indeed extraordinary, even approaching something that defied ordinary logic… yet it still had firm boundaries.

Boundaries that I deliberately created, an invisible line ensuring everything remained under control, never exceeding the rules that had been set from the very beginning.

The maximum lifespan that could be achieved with the help of this candy was only one hundred and fifty years—no more, no less, an absolute figure that could not be negotiated.

Aside from the New Life Candy Tin, the kettle I carried was no ordinary object either. It was a Cursed Tool called the Positive Energy Multifunction Water Kettle, a device that appeared simple at a glance, yet held functions far more complex than what met the eye.

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