Muzan grew up, he became a beautiful young man, but at the age of 18 the disease he had got worsed, while he was lying in his futon he thought, it seems like there is no hope, god has abandoned me.
As a child he thought he could develop a cure for his illness, but it seems that he was not born in Canon, but in feudal Japan, i. e.
all medical equipment was not at his disposal at that time.
Meanwhile in a room of the kibbutsuji family complex, mikoto was heading towards her husband's aposents when she enters she comes across fugaku lying with another woman, despite all the sadness and anger she must beg this man for her son.
Fugaku! , muzan and his first son, you must not give up on him, he is your heir! Please do more for him, I beg. Meanwhile fugaku watched her with his cold and intimidating eyes, sigh, all right, I will hire the royal doctor to examine him, after that there is nothing else I can do, mikoto saw there his last hope, thanked and left the room of fugaku.
Mikoto was going to muzan's aposentos at that moment to tell the news, arriving in front of the room she enters, muzan I have important news for you, I managed to convince your father to the real doctor to come and examine him.
Muzan, who before was lost, felt an Epiphany running all over his body, his eyes shone and he thought, and that!! , the doctor and of course, who would say that after all this time the answer was right in my face.
All right mom, you don't have to worry, I'm sure the real doctor will find a cure for my current condition. Muzan said this with a smile on his face, but no one could tell if it was joy or malice.
As the days passed, muzan's body continued to get weaker and weaker, but the doctor had arrived in his room.
Much pleasure young muzan, I am the real doctor hiruko haruno, I am here for a favor I owe to your father, you can be sure that I will seek in every way to find a cure for your condition.
Mikoto-sama, do not worry, with me here, I promise that I will not let your child die, I am confident in healing him.
Mikoto had his eyes popping with joy and hope, thank you doctor hiruko, save my boy. Over the years his physical condition has been getting worse, I'm very afraid of sleeping, because I think I can't find him the next day.
I'm going todo my best, and so time went by, the doctor was staying in the kibutsuji complex and every day he did experiments with muzan's body, but he didn't know that he would end up creating the greatest monster of all.
Muzan was intelligent, unlike muzan in fiction, he did not give into instincts and killed the doctor, he waited patiently as he did not want to be incomplete as the original muzan and have a ridiculous weakness in the sun.
Muzan was getting stronger, he could feel it, but along with it the instinct of fear in front of the sun also manifested itself, but with more and more experiments, muzan felt this instinctive danger going away.
When finally muzan's body was in the maximum condition of solar strength and endurance, he made the decision.
Today will be the day that I will exterminate the kibbutsuji clan, remembering that the hunters were created by the cursed remnants of this clan, he would not make a mistake of leaving them alive, there were only three people with potential to be onis in this complex.
Her mother, she will occupy the place daki and gyutarou occupied, upper moon 6. She was chosen for two reasons, she will have a loyalty to myself that I do not erase her memories, the second reason is that we are more or less 500 years from the Canon, that is, she has a time potential equal to kokushibou, who was an oni for 400 years, so even if she does not have much potential in terms of strength, the long life time will make her have a force from a higher moon.
The second person and his doctor, people like him are useful if used correctly, although I will have to erase his memories so that he does not remember that it was he who created me, he has the potential to be the upper moon 4.
Finally, his father, because he didn't raise me and didn't give me any recognition, I have to be logical and recognize his strength as a swordsman, the kibbutsuji clan and a clan that directly serves the shogun, that is, we are a military clan.
My father is the samurai who serves the shogun directly, that is, you can consider him the greatest samurai of his generation, he has the potential to be the upper moon 1 that was once occupied by the kokushibou, but unfortunately I will have to erase his memories as well.
Well, it's already decided, I turn my eyes to the doctor and with a frightening speed I move in his direction and drain his chest with my arm, my blood begins to flow in his body and he starts to convulse.
My mother who arrives at this moment is scared by the act, but she does not run away, her love for her son is much greater than the fear she currently feels.
Muzan when she sees her say, mother does not need to be afraid, I have become immortal, and I have to do it too, we can be together for eternity.
Despite the fear mikoto feels at that moment, when she thought of spending eternity with her son, it was enough reason for her to wave to her son and open her arms for transformation.
Muzan made a small cut in her body, and she began to convulse. Muzan waited for them to wake up.
The doctor was the first to wake up from his transformation, muzan quickly moved in his direction and put his hand wrapped around the doctor's neck and raised him in the air, with his eyes
in red he said, from now on you are hiruko moon superior 4, you will forget everything you lived as a human, what will remain will be the instinct to be stronger and serve the muzan kibutsuji.
Hiruko assimilated the information and his orders, knelt down and said, hiruko upper moon 4 his orders muzan-sama.
Muzan waved his head and with a quick movement of his fingers recorded in hiruko's eyes the kanji of upper moon 4.
Meanwhile, his mother woke up soon after, she watched her son and observed the now called upper moon 4. Unlike hiruko, she had all her memories, and was happy about it; her son trusted her.
Muzan, watching his mother wake up, quickly recorded in her eyes the kanji of the upper moon 6. After these details muzan gave his first orders, massacre the kibbutsuji clan is to feed on them, leave the clan leader to me.
Yes, Lord, mikoto and hiruko responded in harmony and set out each in one direction to begin the massacre, or rather the banquet.