Disclaimer: I do not own Detective Conan

Thank you, sakurak504, for beta-read this chapter .

I'm not taking non-canon into consideration. The events of this story starts after the chapter 827 (Tennis Meet Up case).

A/N: Hi, here is the second part of the 'Wonder Drug'. If you read the first part, then more or less you know what you can expect in this part. If you didn't, then I recommend you either to read the first part or the (brief) summary of the events of the first part that I've putted below, before you start reading the second part.

The first chapter starts under the summary of the first part.

The (Brief) Summary of the events of The Wonder Drug Part I: The science project (this story is AU)

The events are taking place between 30 years ago and 17 years ago.

Atsushi moved out from his friend, Souhei Dejima, to live at the organisation that works on a secret science project.

The boss ordered Pisco to kill one of their scientists, Endoso Masato and his wife Haruki, however the boss ordered to not kill their one week old son, Ichirou, instead he was brought into the organisation, where he was raised there. Over the years Ichirou became closer to Atsushi, Elena and Akemi and he liked play with them. Ichirou was told his parents died in a accident.

Before Masato was killed, Masato gave a letter to his best friend, Michio, to give it to his son in a right time.

Atsushi was made in charge of the science project.

Elena came back from London, where she was studying, to work for the organisation. She was also made in charge of the science project along with Atsushi.

Elena and Atsushi got married and had a daughter who named Akemi.

The boss ordered Elena to do tests on Vermouth, and the boss also ordered Elena to act as it was her idea as the boss didn't want to lose Vermouth's trust.

Before Elena went to university in London, she had three years practice in the organisation. She met Vermouth there and as they became close, Vermouth revealed to her about the organisation's main goal and how in the past she had been experiment on which was very painful for her.

The tests on Vermouth involved things like taking samples from her body. The scientists were amazed by how fast Vermouth's body was completely healing from any injury. Some injury healed slower from another, e.g. when her internal organ was injured, but it eventually heals completely, as well. However, if her brain would be damaged, then she would die.

After the tests finished, Vermouth went to America.

The boss ordered Elena and Atsushi to use group of homeless people to experiment on.

Elena, Atsushi and Akemi visited Dejima's house, however he wasn't there instead they met men who lived with Dejima.

Pisco found a group of homeless people: an old man, Iwai Kaimu, two brothers in their thirties, Maki Daichi and Daiki, a teenage girl (16-18 years old), Nakama Riko, and Sanda Moriko, fourteen years old girl. In order to fool them, Pisco offered them a job and place to live, and they accepted it.

Elena refused to do the tests on Moriko due to her age, the boss agreed, for now.

Elena, Atsushi and other scientists were doing tests on the rest of the homeless people. However they didn't do the tests on four of them at once.

Moriko and Ichirou became close friends.

Elena and Atsushi were visiting some conventions where they met Agasa Hiroshi, and some foreigner scientists.

Iwai Kaimu died. Some months after, Daiki died as well.

Elena asks to postpone the research in order for her and other scientists to analyse their notes.

Elena told Atsushi she was pregnant again, which made them happy.

When the tests on the remaining homeless people started again, Elena had to bring Moriko into the lab, however, Elena and other scientists didn't do any tests on her, yet.

Elena got an idea to work abroad on the drug with the foreigners scientists that she and Atsushi met during the science convention.

Riko died in front of Moriko and Atsushi.

Elena and Atsushi had a daughter, again, and they named her Shiho

Daichi died.

Elena and Atsushi asked the boss to allow them to work outside the organisation in a different country. Elena and Atsushi informed the boss they would leave their daughters at the organisation. The boss agreed (he wasn't convinced, at first). However, the boss told them that Shiho also would have to work on the drug, though the boss allowed Akemi to have a carefree life. Elena and Atsushi still had to do tests on Moriko.

Boss warned them if they do something against him then he would kill them.

Elena reminded the boss about the promise they once made to her (when they ordered Elena to do the tests on Vermouth) that the boss wouldn't hurt Akemi, and now also Shiho.

Elena made tapes for Shiho. She sent Akemi to Dejima's house to hide them in there.

Elena asks Ichirou to promise her that he would look after Akemi and Shiho.

In the lab where Elena, Atsushi and Moriko are, Atsushi inflicted some substance into Moriko's body. Right after it, someone show up and kill both Elena and Atsushi.

Moriko convinced the killer to help her to escape. The killer brought Moriko outside the organisation's building. Moriko was able to run, but due to the substance she was inflicted to, she passed out.

Toyama Ginishoro and his wife who were driving back home noticed something on the road. After they got out of the car, they found a baby girl in a over size clothes. Disgusted that someone was so cruel to leave a baby on the road, they know it had to be taken care of.

Chapter 1

Haibara Ai was sitting on her chair checking the document on her computer regarding Apoptoxin 4869's temporary antidote. She had been working on the permanent antidote as often as she could and it left her sleepless some nights. She was worried that every time Kudo took the temporary antidote, his body was closer to becoming completely immune to it. She had promised herself that she would make the permanent antidote for Shinichi no matter what; she owed him that.

She was lucky that she had been able to retrieve the disc that had contained data on APTX 4869. Unfortunately, she couldn't read all the data, but what she was able to read was enough to create the temporary antidote. The complete data still had to be in the hands of the organization; however it was impossible to take it away from them, especially now that they thought she was dead. She couldn't do anything that would make the Black Organization find out about her not being dead. She hoped she would be able to create the permanent antidote even without the complete data.

Although she was angry at him for acting behind her back, Ai was thankful to Kudo for creating the plan which left the organization believing she had died in the explosion. She also couldn't understand what was happening between him and Subaru Okiya. Conan claimed Okiya was on their side, and she believed him. Ai wasn't frightened anymore to be around him, not even by herself. Okiya meant no harm to Ai, and she was certain of it. She had started to suspect that perhaps Subaru Okiya was actually Moroboshi Dai, the FBI agent who had spied on the organization.

If this was the case, then why was he, the FBI agent, around her and Conan? Did he want to get closer to her to obtain information on the members of the organization she used to work for? Of course, Okiya and Dai could be two different people, but both of them using the same phrase, "Don't make that kind of face," made Ai suspicious.

If he was indeed Moroboshi Dai, then confronting Subaru would be useless because he wouldn't tell her. Asking Kudo would probably be useless too. She had already confronted him about Subaru, and he had just brushed her off by trying to calm her down that Subaru was on their side. She decided to leave Subaru alone for now, but she would come back to it at the right time.

Ai's thoughts wandered to a memory of her dead sister, Akemi. Ai had been blaming Dai for her sister's death, but mostly she had been blaming herself.

Akemi had wanted both of them out of the organization so that they could live a normal happy life together that didn't involve creating dangerous drugs and living under constant observation. The organization had used Akemi's desire to free her sister against her. She had become a nuisance to them, and the organization always got rid of nuisances. They would have killed Ai too if she hadn't been working on the drug that the boss had required her to create, but her halt on the drug research had changed their minds.

She hoped that the drug research was still suspended, and the complete drug would never be used by anyone. Ai believed anyone who took the drug was being punished. She and Conan were already being punished, and they hadn't even swallowed the finished drug. No one should mess with it.

Toyama Kazuha would usually be in a good mood after leaving the cinema, where she had just watched a comedy, but not today.

She and her childhood friend Hattori Heiji were supposed to go to the cinema together. But at the last minute, he had called to inform her that he was stuck in some case again. Since she had already bought the ticket, she went to see the movie, but she couldn't focus on it due to that idiot.

Sometimes, Kazuha asked herself why she loved him. She always found the answer to this question. People don't choose why or whom they fall in love with.

However, Kazuha still loved Heiji. She understood he was a detective, which often ruined their plans. But, Kazuha admired Heiji for his deduction skills, even if he could be conceited because of it.

With her head full of thoughts about Heiji, she decided to take a walk. It was dark, but her house wasn't that far. It would help her calm down. She was still angry at Heiji.

Kazuha was just passing by an alley when she heard male voices.

"Don't do it, please."

"Don't waste your breath."

Kazuha's curiosity rose as she decided to see what was going on. Maybe that person needed help.

However, what Kazuha saw made her gasp loudly in fear. There were two men, and one of them had just stabbed another.

Unfortunately, she was heard by the man with a knife. The man had terrifying eyes, and he was breathing heavily.

Kazuha's first instinct was to run and shout for help, but when she opened her mouth and shouted the first letters of the word 'help', the man already had her in his grasp, and stabbed her twice in her stomach before throwing her on the ground.

"Next time, don't put your nose where it doesn't belong," the man said before he left.

Kazuha put her hand on the place where she had been stabbed and curled her body up. The tears flowed into her eyes and the pain was so immense that she let out a groan. She couldn't die! She had to let someone know. Kazuha tried to get her phone out of her pocket; however, her vision became blurry, and she could barely see.

The images of her parents, friends, and Heiji passed through her head. However, an unfamiliar girl appeared in Kazuha's mind; she heard her voice. "You need to stay strong."

"Who-"

Everything went dark for Kazuha.

Ai sighed, her eyes shifted to the right where a calendar hung on the wall.

Oh yes, today is my nineteenth birthday.

Ai had lost sense of time, or maybe her brain had blocked any thoughts about her birthday. Why did she have to remember it anyway? It wasn't like she could celebrate it with the Detective Boys. Agasa had given a false birthday when he had registered her for elementary school. It would be weird if she celebrated her birthday twice a year.

Besides, she didn't see the point in celebrating her birthday, anyway. She wasn't nineteen, at least not physically, and she had different identity now. Her birthday only reminded her of who she used to be: a scientist who had worked on a drug that should never have been created. But, she still had some good memories regarding her birthday, like her sister taking her out for dinner.

A small smile spread across Ai's lips. She missed her sister dearly, and she wished Akemi could be here with her. She wished her parents could be here with her, too, and the four of them could live a happy, carefree life without the Black Organization in it.

However, due to the drug research that her parents had worked on in the past, it was impossible. It reminded Ai about the tapes that her mum had left for her. She had listened to eight of them, but there was still one more left, for her nineteenth birthday.

Ai had decided to leave this tape for this day. She liked to think of it as a birthday gift from her mum, even though her mum would most likely talk more about that 'terrific drug' that she, Ai's dad, and other scientists had worked on. However, Ai hoped that her mum would also talk about things unrelated to the drug. She had done it in every tape, including the last one that Ai had listened to.

She stood off of her chair to open one of the drawers. Ai took out the tape that was numbered nineteen. She glanced at it for a moment before she put it into the tape machine, excited and scared at the same.

"Happy nineteenth birthday, Shiho." Her mum's voice had always been warm, and it made Ai feel at ease.

"I hope you had a great birthday. I remember my nineteenth birthday; I spent it studying on a university exam."

Shiho smiled upon hearing her mum chuckle. Elena talked more about her university life, and how she had been the outsider, which Ai could understand as she had also been an outsider when she had attended elementary school in America.

As Ai suspected Elena talked about the drug as well.

"Last time, I told you about this amazing drug that your dad, our co-scientists, and I are working on. I know you also work on it now, but I hope you weren't asked to do the things that I had to do. I feel guilty because of it. I also had to lie to a close friend of mine, and this lie is..."

Ai had her eyes wide open while she listened to her mum. She was already aware of these things that her parents had to do. But about this lie, it was the first time she had heard about it. If her mum's close friend found out about it, then maybe things would change.

Maybe.

"Mm," Kazuha purred. Her eyes opened partly, and she could only see ground through the small gap.

Why am I laying on the ground? Kazuha asked herself.

Two men. One stabbed the other, and the feeling of a horrible pain after she was stabbed, as well. Kazuha raised her upper body from the ground instantly as soon as she knew why she was here. Her heart was beating like crazy, and her head was moving in all directions before it stopped on the man's body. Kazuha's eyes filled with tears while her body trembled.

However, there was something weird. She couldn't feel the pain. Kazuha touched her stomach, but she couldn't feel a wound. Confused, Kazuha lifted her shirt, which was covered with blood, up. She widened her eyes when she found no wound, just a faint tint of blood. Kazuha touched her stomach again and looked at it closely. She even checked her chest just in case her memories were playing tricks on her, but she found nothing.

What was going on? Her shirt was covered with blood, so Kazuha wasn't delusional, she had definitely been stabbed, so why weren't the wounds there anymore?

"What is happening to me?" Kazuha asked herself, terrified.