I don't need to remind you that this story was written by two authors. 4fireking from fanfiction and also fictionpress and Kaede Tsukino. I'm not very good at the mystery genre but my partner is. All mistakes I made he was able to correct. Since this is an OC story we have to give information about the OC before writing the story. Here it is:

Name: Yoru Kurihara

Gender: Male

Age: 6-7 years old, but is actually 17 years old

Personality: A sensible person with a good sense of justice. He dislikes troublesome things and can't stand annoying people. He's not afraid to speak out his mind either and can be very blunt too. Occasionally says things that seem insulting but means no harm. Sometimes sleeps during classes.

Background:
As the son of a detective and the director of a hospital, he inherited his father's deductive skills and his mother's knowledge of the medical field. He often works at his father's detective agency part time to help out. He usually serves the clients tea or coffee and snacks. Despite only helping out, his father gives him assignments that he deem too boring to handle like finding a lost pet or helping the police find some bank robbers. His father never lets him handle murder cases since he didn't want to ruin his childhood but somehow most of the cases he gives to him turn into murder cases. His mother often yells his father for putting their son in such dangerous situations and threatens his father with syringes. Despite that, they are a close loving family. But one day, Yoru was given a case by his father to investigate the mysterious letters an idol has been getting. The notes told about getting back what was taken from them. The case was resolved. Yoru found the perpetrator who was. The perpetrator was a jealous idol who used to be classmates with the idol and couldn't handle being inferior to the idol so she just wanted to scare the idol. However, the idol was manipulated by the Vermouth to act as a distraction from the police as she went to retrieve an important disk that came into the possession of the idol by accident. Vermouth had an underling take the disk back, but he was caught by Yoru. The underling was an executive of the talent agency the idol came from. He shot Yoru several times and used the poisonous drug APTX 4869 (the same drug that was used on Conan/ Shinichi and Ai/ Sherry) on Yoru and left him to die. The man makes a call to Vermouth saying that he retrieved the disk. Vermouth told him to meet up as scheduled. He was later killed by Vermouth. Having turned into a child, Yoru had no leads on how to return back to normal, but he did have a lead to the ones who turned him into a child. Before the disk was taken, Yoru read through it. In one file he found, he saw the pictures of Conan/ Shinichi, Ai/ Sherry, and Ran. He remembered seeing Conan/ Shinichi in an article of about him being Kaito Kid's rival. He transfers into Teitan Elementary School with the purpose of finding out Conan/ Shinichi's connection with the people who turned him into a kid.

Skills:
Like most detectives, he has a logical and sharp mind. He is skilled at in multiple areas like medicine, sports, and self defense.

Please read and review

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Being a detective is about more than just having a good memory. It's not about making guesses either. It's about using logic. The detectives are nocturnal creatures—working at night and sleeping in the day. Some detectives are inspired by fiction, non-fiction, and tragic memories. Detectives do the work God never does...help people and making bad people pay.

In an all boys boarding school there was a young smart boy named Yoru Kurihara. Yoru was a sensible person with a good sense of justice. He dislikes troublesome things and can't stand annoying people. He's not afraid to speak out his mind either and can be very blunt too. Yoru was dressed in his school attire but his hair had red streaks in his natural black hair. His eyes are blue.

Yoru was at no fault. He never did anything bad to this school, and yet he was expelled from his school...at least he was going to be expelled. Today he had a science test and a student who always had something against Yoru, Mizu Kuzumi, dropped a sheet near Yoru's table. The sheet was the answers to the test and it was in Yoru's handwriting, forgery of course. But no one believed Yoru when he said it wasn't his.

One week later, not being able to go to another school for three months, Yoru was forced to help out at his father's detective agency. Then after transferring into Teitan Elementary School, Yoru watches Conan/ Shinichi from afar before deciding to make his move. He keeps minimal interactions with Conan/ Shinichi to avoid suspicion. He gathers information about Conan/ Shinichi and listens in on conversations about the famous Detective Boys. Ayumi sees that Yoru is always alone and feels sorry for him and feels that Yoru is similar to Conan/ Shinichi. During PE, the boys are playing soccer. Yoru is on the opposing team of the team Conan/ Shinichi is on. Yoru proves to be on par wtih Conan/ Shinichi which surprises Conan/ Shinichi. Genta and Mitsuhiko invite him to hang with the Detective Boys after school so that they could ask Yoru how he was able to play against Conan/ Shinichi who was the best in their class when it came to soccer. On their way to Professor Agasa's lab, they run into a murder case. Yoru was going to solve the case until Conan/ Shinichi dives in first. Yoru sits back and decides to let Conan/ Shinichi handle it. Conan/ Shinichi becomes wary of Yoru when Yoru subtly helps out. Yoru is suspicious of Conan/ Shinichi due to his vast knowledge that no elementary school kid should have and concludes that Conan/ Shinichi is just like him a person who turned into a kid due to the drug that was forced onto him.

Then one day a pretty woman walked into the office. She was tall, skinny but not slender, wearing a red dress and a white coat. She had red makeup and black sunglasses. She wore a hat that looked exactly the same as her white coat. She was a client.

Clients were hard to find in a detective agency, but to Yoru's father they started coming in like cars in a parking lot. On slow days Yoru would see eight or ten people showing up with their cases. Some were trying to sue, some were police officers asking for help finding bank robbers, and others were old ladies looking for their lost pets. All of those cases were boring, Yoru never took them. What seemed different about this attractive lady was her holding a folder. A letter slipped out of the bag, but she caught it and slipped it back in her folder. Yoru worked as someone who gave tea and snacks. To the clients he was just a cute little kid trying to help the clients through a bad day. No one knew he was the detective of the agency. He approached the attractive lady.

" Would you like some tea, ma'am?" Yoru asked.

"What a cute child." The woman patted Yoru's head.

Although Yoru knew she was only being nice, it didn't bide well with him that a woman was calling him cute. 'I'm definitely going to find the antidote.' was what Yoru was thinking.

The woman and Yoru's father start talking about the case the woman came in for. The woman revealed herself to be the wife of the president of a famous company who had been receiving threatening letters. The woman was worried about her husband so she wanted Yoru's father to find the culprit. Yoru's father accepts the case and takes Yoru with him.

There they find another letter this time stabbed into the door to the president's office.

" Read this letter well because it is the last one you will get. By now you know there is no loyal fans only a loyal husband. I wonder how long he will stay with trash like you when I show him all your darkest secrets. He might even have read this letter and is showing it to you right now. I'm hoping that happens, but I'm not that lucky. Don't think any amount of money you give me will change what I will do to you. Either you tell your husband what happened to your last one or I will make the people you don't want to know see it. Your friend the Cheshire Cat Two."

Yoru's father folded the letter and put it in his coat. It was to be used for evidence because of finger marks. " If this letter was put here by someone in the building we can just look at the tapes and-"

" No. Look at the camera." Yoru pointed at a camera sticking out of the wall. It was covered in a plastic mask of the cartoon Cheshire Cat. " They knew there was surveillance there so they put a cat mask there."

" So the person sending these letters could be working at the presidents office? Is that what you think?" Yoru's father asked.

" Maybe. Tours are also taken when the president is away. Maybe someone who was taking the tour did this. People who take the tours normally don't take it more than once, so we should ask for footage of the camera of anyone who took the tour twice."

"No, little boy, you should leave this to your father. Children shouldn't play around in adult matters." The woman told Yoru.

Yoru was peeved to be treated like a child even if his appearance was one.

The woman takes Yoru somewhere. "There's a lovely nursing room for cute, little children. You can play with the children there until your father finishes his work."

Before Yoru could protest, the woman had already taken him out the room and through the hallways.

'Guess, I'll leave it to Dad then.' Yoru tries to think of a way to change the woman's mind.

"Oh my, what do we have here?" A woman with black hair tied in a bun and wears rimless glasses appears before Yoru and the president's wife. She is the president's secretary. "I didn't expect to run into you here. And I see you even brought a child with you. Not some illegitimate child you had behind the president's back, I presume?"

The president's wife turns meek and quiet as she felt uncomfortable seeing the president's secretary. Yoru notices this.

"I'm looking for my daddy but got lost. This nice lady found me and told me she'd help me find daddy!" Yoru puts on the innocent child facade. "He's always working and hardly plays with me."

"I see, but your father is a working adult. It can't be helped. He's working very hard for your sake." The secretary kindly advises Yoru acting completely different towards Yoru compared to how she talked to the president's wife.

'Except, he's the one pushing his work on me.' Yoru internally retorted.

"I'm sure one day he'll find time for you. After all, he genuinely loves you unlike a certain someone I know who fools around." The secretary says as she takes her leave.

Yoru slipped away and found his father taking the tour. He looked like he was about ready to fall asleep, but he willed himself to stay awake. Yoru walked up behind his father and tapped him on his shoulder.

" Why are you taking the tour, Dad?" Yoru asked him.

" I tried finding someone who took the tour twice like you said but all the surveillance cameras picked up were people doing by once—families, friends, girlfriends and boyfriends, retired people and old people—none of them took the tour twice and none of them looked like they were paying attention."

" I can't believe I'm saying this, dad, but maybe you were right about the person working at the office." Yoru put two fingers on his chin and rubbed them thoroughly. " It would have to be someone with lots of clearance. Someone who can get by and no one would notice them."

" Like him?" Yoru's father pointed at a chubby guy with short black hair and big frame glasses walking by with a card on his right shirt. He was drinking a cup of coffee.

" Not him, dad. It would have to be someone taller because a short person would have to carry a chair or ladder to block that camera and there's cameras in every room in the presidents office."

" What about her?" He pointed at a women who was tall, had long black hair and small bangs, red lipstick, and amber eyes. Yoru could smell her perfume from here, and it smelled like something girls use when they try to get men to notice them. She also had one button open from her suit revealing her cleavage.

" Not here either. She doesn't have the clearance to get to the presidents office."

" You're right. We had to ask one of the guards to take us there."

" He's also too short to put it there. The person we're looking for didn't jump to get to the camera. They stood under it when they put the mask on...unless."

" What is it, son?"

" What if they were wearing something that could make them get taller. You need to look at that video footage again."

As per Yoru's instructions, his father went to the security room to check the footage but learned that it was erased.

Meanwhile, Yoru was doing some investigating of his own. He searched the area but found nothing until he found a diamond earring in a large potted plant near the security camera near the surveillance camera. Yoru has a clue as to who the culprit might be. He takes out his magnifying glass and checks the ground underneath the camera and finds nothing.

'Nothing. Not even an impression.'

Yoru goes out to find his father. On his way, papers start flying over him.

"Oh no, I'm so sorry." A woman with long wavy brown hair tied back apologized to Yoru as she picks up her papers.

Yoru helps the woman with her papers.

"Thank you for helping me. You're such a nice child. I need stop with all these careless mistakes. And just when I got promoted too." The woman pouted.

"Promoted?" Yoru inquired.

"Yep, I may not look like it, but I'm the new manager." The woman proudly declared as she puts on her usual gentle smile.

"You?" Yoru sarcastically remarked. He found it hard to believe that a klutzy woman like her is capable of managing anyone.

"How rude! I'll have you know that I've been in this company for three months and already got promoted to manager in no time."

'Three months...' Yoru made sure to keep that information stored in his mind.

"Hey Miss, do you by any chance know who this belongs to?" Yoru takes out the diamond earring he found in the potted plant. "Someone lost this. I'm looking for the owner."

"This is.. !" The woman was surprised to see the earring. "This belongs to the president's secretary, Shimizu-san. (Full name: Yumi Shimizu)"

'The president's secretary...' Yoru takes note of that.

"Yes, you see. I heard this earring was from a pair of earring that the president gave to Shimizu-san after a year since she took over the secretary position. She used to wear them all the time but recently stopped wearing. If I recall, normally, she takes good care of them, but lately she's been careless with them. She even accidentally left them in one of the offices."

Yoru processes all the information he received and stores them inside his head.

" Thanks again for helping me pick up my papers," the manager smiled.

" You're welcome," Yoru said.

After she left Yoru ran to the surveillance room to see how his dad was doing. He had so much to tell him. The secretary was his number one suspect. Yoru knocked gently on the door. The door didn't open. Yoru banged on the door again but nothing happened.

" Dad, it's me. Please open up."

The door swung open but Yoru backed away before it could hit him. He walked inside that building and found his father putting his head on his arms and sleeping.

' Jeez dad, can you not do the simplest things?'

However, this was not his father sleeping on the job. He looked at the surveillance cameras...they were nothing but static. The tapes that were beside the screens were missing. Could Yoru's Dad really do this? He knew his dad wouldn't do something like this on purpose. Yoru stepped on something sharp and in a line. He looked down and saw he was stepping on a door to the vents.

' Someone must have snuck in here and stole the tapes,' Yoru thought.

That wasn't the only thing he noticed. He noticed a baseball bat laying on the ground. But the tapes were already erased when Yoru's dad checked them. He reported it to the president's security and they got new tapes to record the messages.

Yoru processed the information in his mind like a computer downloading new files. He played everything back in his head: the letters, the mask, the erased tapes, the secretaries earring, someone wiling to hurt his father just to find some tapes. It didn't make sense...

" I got it," Yoru snapped his fingers. " The secretary was doing in a something in a room she couldn't avoid so she had no other option but to destroy the tapes. Whatever she did she either didn't do it right or forgot something that could tie her back to the scene of the crime. She had to destroy the tapes or someone would have suspected she would be the blackmailer."

" Yoru?" Yoru's father was starting to get back up. He felt like a hangover, his head hurting and him being unable to remember what happened. " What happened?"

" There's no time for that, dad. We have to find Ms. Shimzu-san."

"The secretary?" Yoru's father didn't have the slightest clue why her. The woman was a diligent worker and quite pretty too. She didn't look like someone who'd do anything bad. "Don't tell me you think she's the culprit! That's not possible. She even brought me some snacks."

"Snacks?" This caught Yoru's attention.

"Yeah, she brought me some cakes."

'Cake!' Yoru checks over the air conditioner duct where the culprit had supposedly entered through from. He sees four screw holes. One on each corner of the shaft. Then he checks the metal exhaust hood he stepped on. He found four screw holes on each of the corners matching up with the shaft's opening. He looks over the ground to find four screws on the floor.

"Hey Dad, were there any other people who came in here?"

"Yeah, the client and a nice lady."

"Did they give you anything? And do you remember the order they came in?"

"First, it was the secretary who offered me some cake. Then the nice woman, she poured me some tea. Last was the client. She gave me some wagashi."

'Cake. Tea. And sweets.' Yoru ponders on the thought of which one it could be until something caught his attention.

*sniff* sniff*

Yoru smells something in the air.

"Lavender?" Yoru recognized the smell as lavender.

"Oh, that must have been from the nice lady. She had on the sweet scent of lavender on her."

'This fragrance... It's familiar.'

Yoru then recognized the lavender scent as the same scent he smelled from the manager.

"The secretary. The manager. And the client." Yoru muttered. "Those are our suspects and likely the culprit behind the case too."

"Eh? The secretary and manager I understand, but the client?" Yoru's father questioned.

"Yes, she's a suspect too. We can't overlook any possibility. She might her agenda for doing so which is why we can't exclude her either. There have been several cases where the client used a detective to clear their name."

Yoru's father couldn't argue at his son's reasoning.

"The ventilator didn't show any signs of forced entry and could only be opened from the outside. Likely, that the culprit left it open to make it look like they came through the ventilating shaft. The bat was probably used a diversion from the real method that put you to sleep. Chances are that you consumed some kind of sleeping medication in one of the three you consumed. Now the question is who the culprit could be?"