Dangerous game

It was a fine Saturday morning and Conan Edogawa was still living with Ran and Kogoro Mori. What they didn't know was that Conan was actually Shinichi Kudô, a high school student Ran had known for years and with whom she was in love. Shinichi was a famous school detective in Tokyo and was in the process of uncovering a deal when he was spotted and knocked down by an accomplice in gin, vodka. Vodka gave Shinichi a poison that should have killed him, but Shinichi only shrank to the size of a five-year-old. But he kept his mind. And even as a little boy, he uncovered the trickiest cases. Kogoro, Ran's father and private detective (a lousy one, mind you), benefited again and again from Conan's instinct. But the day was approaching when Conan Shinichi and Ran would be happy again ...
As I said, it was Saturday, the sun was shining and Conan was with Ran in the "Tropical Land", an amusement park.It was the park in which Shinichi had disappeared, and Ran knew that she would not see him again anytime soon. And this is where she would discover her boyfriend's secret, at least that's what she thought. But when the two returned home after a day of fun, Ran lost that feeling. She had felt it very strongly, Shinichi was near her. She actually felt that since Conan lived with her. That made Ran thoughtful. She immediately retired to her room and locked the door. Kogoro, who actually wanted something to eat, had to go to bed hungry. Shortly after Kogoro disappeared into his room, there was a knock on Ran's door. She opened it. A person dressed in black stood before her, covered her mouth and forcibly dragged her out of the detective agency. Ran passed out and only woke up in a poorly lit room. Two men stood in front of her, both dressed in black. It was gin and vodka. "Where is he?" Vodka asked the still not quite awake Ran in a loud voice."Where ... is who?" "Your friend Shinichi Kudô! We know that you spoke to him on the phone, Ran. Actually he should have been dead long ago, but something went wrong ...", Vodka said, still louder Voice. “You wanted to kill my Shinichi?” Ran sounded desperate. She was very worried about her boyfriend, much more than usual. Meanwhile Conan had noticed that Ran was no longer there. There was a scrap of cloth from Ran's shirt on the living room floor. Conan hurried to see Professor Agasa, an old friend. Agasa was the only one who knew about Shinichi's story. "If only I had told Ran that," Conan muttered to himself. When he arrived at Agasa, he saw him storm out of the house. "I have an antidote, Shinichi!" The professor yelled out loud. "That's great Professor, give it to me!" Replied Conan. He snatched the vial from Agasa and swallowed the contents. "Shinichi, wait !!!" The professor was now beside himself. "There is a 50% chance you will die in the process.At the same time or up to five hours later! " "What? "Shinichi wondered about himself. Finally he had his voice back, his body, his strength. But what if the antidote should mean its end?"