"Ding-a-ling!" As the class bell rang, the first-year Class B students of Teitan Elementary School stood up one after another to pack their things, preparing to go home. Ms. Kobayashi shouted from the podium, "Tomorrow is the weekend, don't forget to do your homework!"
"We know!!" Everyone answered Ms. Kobayashi, then quickly ran out of the classroom.
"By the way, Yuu and Haibara have been leaving so early recently," Mitsuhiko said on their way home.
"Maybe they've been busy lately?" Ayumi said uncertainly.
Conan also noticed this. Ever since Yuu brought out the APTX4869 last time, he and Haibara seemed to have been in this state. "Could it be that they've been working on the APTX4869 antidote? Hmm! In that case, it makes sense why they've been leaving so early recently. And Haibara is the inventor of APTX4869, Yuu is also a doctor of pharmacology, plus now that we have the physical APTX4869, the antidote will definitely be developed quickly!"
Thinking about the antidote, Conan's mood couldn't help but become excited. He decided to go to Professor Agasa's house to see how the antidote research was progressing. "Um, I have something to do, so I won't go with you!" Saying that, Conan ran off.
"Seriously, Haibara, Yuu, Conan, one after another like this, what are they going to do?!" Genta said unhappily, looking at Conan's receding figure.
"Heh heh..." Mitsuhiko and Ayumi smiled helplessly together.
Professor Agasa's house, basement.
Yuu, wearing a white lab coat, carefully looked at a capsule. "This should be considered a success, right?" Yuu said to Haibara, who was sitting on the other side of the lab bench.
"Although I had the physical APTX4869 for reference, plus your assistance, I can't guarantee success. This is merely a trial product. Because you said Heavenly Dynasty's white liquor would turn us back to our original form, I added white liquor to it. But since I don't know which component is effective, I also don't know how effective this trial product will be?" Haibara looked up and said, "Do you want to try it, Yuu-kun?"
"I'll try it!" Just then, Conan rushed in.
Yuu looked at Conan's small frame and chuckled, "Shinichi, it's not that I won't let you eat it. This medicine is still a trial product, and you don't have a body as strong as mine. What if you just die from it? How would I explain that to Ran?"
"How is that possible! Although my body isn't as good as yours, it's not bad either!" Conan said unwillingly.
Haibara said to Conan with a serious expression, "Great detective, when it comes to medicine, you'd better listen to our advice!"
Seeing Yuu and Haibara both say this, Conan had no choice but to give in.
"It doesn't seem to have any effect!" Yuu said indifferently after taking the antidote trial product. However, Yuu immediately regretted it. "Ah!!!" A tearing pain came from his body, just like the concentrated white liquor pill Yuu had taken last time.
Yuu's body, at a speed visible to the naked eye, ripped through his clothes and returned to his original form in front of Haibara and Conan.
Yuu felt his body filled with power. This feeling hadn't happened since he shrank. "Excellent! I, Yuu, am back!"
"While you're happy, I don't want to interrupt, but can you please notice that there's a girl here?" Conan found a bath towel and handed it to Yuu.
"I was too happy for a moment," Yuu wrapped himself in the bath towel and scratched his head, chuckling, "Haibara probably won't blame me, right?"
"No, compared to that, I'm more concerned about the actual effect of the trial antidote?" Saying that, Haibara had Yuu lie on the bed and began to use machines to examine Yuu's body.
"By the way, the equipment here is quite complete," Conan said, looking at the basement's setup.
Yuu said triumphantly, "Of course. With so much money, the equipment must be good, right? Otherwise, how would we make the antidote?"
"I almost forgot, you took that billion." Conan's face twitched a little.
"Shinichi, if you ever run out of money, come find me, wahahaha!" Yuu said, laughing loudly while lying on the bed.
However, Yuu and Conan didn't notice that Haibara's eyes lit up when she heard "one billion."
"Alright," Haibara left the computer screen and turned to Conan. "I can't believe it. According to the data, his body is as normal as can be. It's as if he never took APTX4869."
"Does that mean the antidote has been successfully developed?" Conan said excitedly.
"I guess so?" Haibara was a little hesitant to believe that the antidote had been successfully developed so easily.
Conan couldn't wait. He immediately took an antidote pill.
Then, a minute passed, he didn't change at all. Twenty minutes passed, he still didn't change. Thirty...
Haibara understood somewhat. "It seems the antidote failed."
"But why did Yuu change back?!" Conan said incredulously.
"Perhaps it's because I threw up APTX4869 when I escaped from the Organization's base," Yuu said.
"That's the only explanation. APTX4869 only partially functioned in his body, so this semi-finished antidote allowed him to revert," Haibara explained.
Conan thought for a moment. It seemed there was no other explanation.
Seeing Conan's disappointed expression, Yuu spoke up to comfort him: "It's alright, even if we failed this time, it doesn't mean we'll always fail. With Haibara and me, we'll definitely develop the antidote. You have to believe in me and Haibara!"
"Okay." Conan replied unenthusiastically. "Then I'll head back first."
"Why did Shinichi go back looking so dejected?" Professor Agasa, who had just come to the basement, was startled to see Yuu back to his original form. "Yuu, you?"
Yuu then told Professor Agasa what had happened.
"So that's it!" Professor Agasa understood what was wrong with Conan earlier.
"So, Professor, since my house has been repossessed by the bank, I can't stay at Ran's house anymore. Can I stay with you, Professor?" Yuu asked.
"No problem. I have plenty of empty rooms anyway, and with one more person, this house will be livelier," Professor Agasa readily agreed.
"Then I'll have to trouble you with Uncle Kogoro and Teitan Elementary School, Professor," Yuu said a little awkwardly.
"I watched you grow up, after all!" Professor Agasa patted Yuu's shoulder, then walked out of the basement.
"Then, please take care of me from now on, Haibara," Yuu turned to Haibara and said.
"I'm going to take a bath now, and then I'm going to sleep. Don't disturb me." Haibara said, then also left the basement.
"Heh heh." Yuu smiled wryly. "How uncute!"
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