Tokyo, Japan
It's a typical day in Tokyo with the busy life of every citizen, who just focus on their life and ignored other things. However, the crowd walking on the pavement soon changed their attitude when an odd phenomenon happened.
The air suddenly spiraled until two unknown men appeared from thin air.
"So this is Japan? This country is far more advanced than to our village, right Obito?" Madara asked while admiring the modern technology of this world. He observed dozens of high buildings and construction around them. Furthermore, to his surprise, the people in this world used a metal box with wheels for moving.
"Yeah! But why do these people just keep their eyes on that rectangular device while walking? How they could avoid obstacles in their way?" Obito questioned in curiosity. He wondered what that electric device could do.
"Forget it! I have already found a Ramen restaurant over there!" Obito told Madara in excitement as he pointed toward a Ramen restaurant near them.
"Let's go! My stomach can't resist the hunger anymore." And thus, They walked toward the restaurant and entered it with indescribable thrill.
But as soon as they opened the door, other customers gave them a weird look due to their clothing. The Uchihas almost forgot that they were still wearing the Akatsuki costume, they must be eccentrics in other person's eyes.
Thankfully, the restaurateur greeted them friendly with a smile.
"Welcome, please come in!" As he said, Madara and Obito got their seats instantly. After skimming the menu, they decided to choose the best Ramen in the restaurant.
"Hey boss, I want to order two bowls of special Ramen for us." Obito requested cheerfully to respond with his generous attitude.
"Okay! Please wait for..." Before the restaurateur couldn't finish his sentence, a gang of six Yakuzas broke into the restaurant by kicking the door violently.
"Oi! Oi! When are you gonna pay the protection fee, Haru!? You owe us for 3 months already!" the boss of the gang shouted in anger, making all the customers scared as hell. As a force of habit, all of the customers immediately went away to avoid any troubles that didn't concern them.
Now only Madara and Obito remained calmly in their seats, ignoring the intense atmosphere between the Yakuzas and the restaurateur.
"Huh? Why are you two still here? Do you want to get beaten to death?" the boss of the Yakuzas asked them aggressively and ordered his subordinates to force them out.
All of sudden, Obito stood up from his seat and walked toward the boss.
"Who the hell are you?" the boss glared at Obito annoyingly but he didn't know the eye under the mask which he was staring was a Mangekyou Sharingan.
"Leave!" Obito shouted. Instantly, the Yakuza boss got stunned for a few seconds.
"My apologies! Hey Haru, your protection fee for the last three months will be written off if you let these two eat for free! Have a good day!" the Yakuza boss suddenly apologized to them politely and ordered his subordinates to leave in peace.
Just after the Yakuzas were gone, the restaurateur immediately shanked Obito's hand and thank him gratefully.
"You have saved my life, Obito-san! What I can do to return this favor?"
"It was nothing! Just serve us well with your special Ramen." Obito said.
"At your service, sir! I will make them as fast as possible!" Haru answered excitedly and went to make two bowls of special Ramen for his savior.
Afterward, Obito returned to his seat next to Madara, making an amusing smile under his mask.
"So what did you do to that man?" Madara questioned after witnessing the recent situation.
"Well... I just trapped him in an illusion of my Tsukuyomi. Inside his illusion, I tortured him until he agreed to my request, asking the restaurateur to let us eat Ramen for free." Obito responded.
"It's good to see you use Tsukuyomi for such a purpose. Thanks to you, we now have a free meal." Madara stated.
"Aww, you're embarrassing me, Madara! Don't flatter me like that!" Obito said embarrassingly with the voice of a school girl. He didn't expect to hear that praise from Madara.
"Ramen is coming!" Haru announced with excitement as he put two bowls of Special Ramen on the table. They were decorated with Chasu pork, soft-boiled eggs, green onions, seaweed, and Menma (preserved bamboo shoots).
"They're free for you two! Please enjoy and give me your thoughts!"
"Thanks for the food!" Obito and Madara held their chopsticks and started eating their Ramen.
"Not bad! It tastes the same as I remember..." Madara commented after tasting the soup and noodles.
"Uhm! It's so delicious! I appreciate you for cooking this Ramen, Haru!" Obito exclaimed in pleasure while enjoying the Ramen.
"Thank you." Haru gladly responded. All of sudden, Madara stopped eating to ask him about the opportunity for a job.
"Haru, do you know any pharmaceutical companies in Tokyo? I want to apply for a job there."
"Hmm...you can try to get a job in Pfizer Inc. It's the biggest biotechnology and pharmaceutical corporation in the world. Anyway, It has an office location at Shinjuku Bunka Quint Building in Shibuya city."
"Thank you. That's all I need." Madara made a cunning smile on his face. In fact, no one could know what he was planning in his mind.
Pfizer's office in Japan, Shibuya city
Inside the laboratory, a spiral emerged and twisted the space until two men came out of thin air. After eating the Ramen, Madara immediately requested Obito to teleport them here for his plan.
Although Obito required him to explain his motive, Madara insisted that he wouldn't reveal any part of his plan until this moment. And thus, they eventually got into this lab.
"So what are you going to do here?" Obito questioned his comrade in curiosity.
"Do some experiments to see if my theory works." Madara answered.
"First, find for me two laboratory mice and put them under a Genjutsu."
"Okay!" Obito went toward the cage and took out two mice from it. As Madara said, he used his Sharingan to control their actions through a Genjutsu. After that, he put two obedient mice on the metal tray.
Meanwhile, Madra took off his cloak, using the scientific knife to cut a sample of Hashirama's cells from the face on his chest.
"Wait a minute... you're gonna transplant Hashirama's cells to the mice?" Obito asked as soon as he realized what Madara was going to do.
"That's right. Now silent and just watch!" using a syringe, Madara injected the first mouse with a mix of pure water and Hashirama's cells at the rate of 50%. After 10 seconds of waiting, the mouse suddenly had a convulsion as white spots started spreading over its body. Eventually, the mouse stopped shaking because of the sudden death, Hashirama's cells had killed it by attacking its brain.
"Why I'm not surprised? Hashirama's cells will kill everything that isn't compatible with it." Obviously, Obito knew this would be the end for the mouse. Only those who were extremely lucky or had a large reserve of Chakra could survive after implanting the cells of the First Hokage.
"Indeed! You should feel lucky since you're an Uchiha. Otherwise, Hashirama's cells would kill you when I regenerated half of your body with it." Madara added a hidden meaning to his words, making Obito realize the purpose of this experiment.
"Wait a minute? So you mean... there is no risk in transplant Hashirama's cells to the Uchihas?"
"I just came up with that hypothesis recently. I, you, and Sasuke all got transplanted with Hashirama's cells. Miraculously, We all survived and are completely suitable for the cells of Hashirama. Do you really think it's just a coincidence?"
"Now you mention it... in Orochimaru's experiment of inoculating Hashirama's cells into children, only a boy named Yamato survived out of 60 test subjects."
"However, the only way to know is to continue this experiment." Madara used another syringe to extract a few drops of his blood. He then combined a small amount of his blood with Hashirama's cells respectively at the rate of 50%. In the end, the mixture he got was a light purple liquid.
"This moment will change the world forever!" as his declaration, Madara injected the second mouse with the purple liquid. This time, the mouse showed no dangerous reactions and stayed well. Madara himself considered this as proof that his theory was proven. Finally, he extracted the rest of the purple liquid into a small glass vial.
"I think I will call this fluid..." holding the tiny glass vial in his hand, Madara hesitated for a while as he couldn't choose a name for his invention.
"How about... Rinne Serum?" Obito suggested.
"That's a good name. From now on, this mixture shall be called Rinne Serum." Madara gladly agreed.
"But what are you gonna do with the Rinne Serum? Mass-produce it and give everyone in this world a vial?" Obito asked. However, his silly idea was turned down by Madara immediately. Because more than anyone else, Madara himself was well aware of the terrible consequences of such a work.
The Sage of the Six Paths indirectly triggered a centuries-lasting war when he distributed Chakra to everyone in the world. He would never repeat the mistake of his ancestor again.
"That will make this world fall into chaos! Did you see what Shicksal do the poor girl named Wendy? They turned her into a Herrscher because of their greed for power."
"The power of Rinne Serum will corrupt the humans on this planet like Chakra in our world. Once their common enemy was defeated, they would wage wars and slaughter each other. Henceforth, we will just give this great power to those who are truly worthy."
"I see... your ultimate goal is still achieving eternal peace, isn't it?" Obito asked. Finally, he knew Madara would always be Madara and nobody could change his ideal.
"That's right. There's no point in defeating Honkai but failing in preserving the peace of this world." Madara stated. All of sudden, he turned toward the corner of the lab, realizing what was watching them the whole time. From his palm, a sharp black rod was launched toward the security camera, destroying it right away.
"Tsk... I should have smashed that device from the beginning. Obito, incinerate all test subjects immediately!"
"Amaterasu!" Obito instantly burned the mice with the deadly black flame. Being put in a Genjutsu, the second mouse didn't react to the pain that Amaterasu caused. Instead, it let the fierce black flames consume it until only ashes remained.
"We won't let any clues left. No one shall know the truth about this discovery!" That day, Pfizer's office in Japan was burned down by a black fire that couldn't be extinguished.