Hey, I'm Mystic Sky. I'm a new member here, but I may have reviewed on your story before as Mysterious Guest. Yes, I finally got an account and I'm very excited. So excited I thought of this story and it's plot in under an hour and got this all typed. This is my first story, so please no flames. Constructive criticism is welcomed though. I promise though, it will get better. Or worse, but let's not hope the later, kay?

Disclaimer-I don't own Death Note. If I did, Matt, Mello, BB and L would all still be alive.

On a Monday night, in early January, the Yagami house was quite. Everyone was sound asleep, except a fourteen year old girl by the name of Sayu Yagami, who was silently typing away at her computer. About a month prior, her father had shared with her the unsettling news that he was working on the Kira case. And Sayu had the suspicion that Light was working with him, since nearly every time her father was gone, Light was missing as well. Not only that, she suspected that Light was Kira! No matter how much she tried to deny it, she knew it was no good.

A little after Kira had arrived, her beloved brother had started acting weird. First she dismissed it as nothing, but then she started to grow worried. She noticed he had started becoming a little bit more paranoid. At first she thought it was about Kira, but so far their main target had been criminals. So she decided that she was going to snoop around his room to see if there were any clues as to why he was acting so strangely. He could just have a girlfriend they didn't know about for all she knew. But when she was going to, she found his bedroom door locked. Sayu, not knowing he was inside, was a bit startled when he opened the door. And so it didn't look like she was trying to sneak into his room, she made the quick excuse that she needed help with her homework. He seemed to buy it, which Sayu was grateful for. But she was also a little upset. Did he think she was stupid or something? Little did he know Sayu was a lot smarter than most people thought.

Yes, Sayu was sure Light was Kira. It all added up. And Sayu knew she wasn't the only one who thought so. She knew that there were camera's around the house. She wasn't blind. Though she had to admit, they were hidden very well. Sayu wouldn't have seen them if she didn't drop a battery for the TV remote and have it roll underneath the end table, which so happened had a small camera taped under it. Sayu noticed it of course, but pretended that she had no clue it was there and the only thing that she was focused on was finding the lost battery. She was almost tempted to grab the camera and disassemble it, but decided against it. At least at that time. But yesterday, when she decided that she was going to do it, she found that it was gone. So that brings here to where she is now, sitting on her bed and writing on the laptop she got for Christmas. Right now, since there were no more cameras, she was making a list of all the things that point towards Light being Kira. Sayu sighed, it was nearing midnight and she was getting tired. She reread what she had written so far.

Why I think Light is Kira

1. Since Kira's appeared he's been more distant

2. He's more cautious

3. He's locking his door

4. He's seems to have been aware of the cameras

5. He's spending more time in his bedroom

6. He seems to be more on edge

7. He doesn't really care for us anymore

8. He won't admit when he's wrong

Well, Sayu thought, trying to hold in her giggles, but failing in the attempt, At least that part's pretty much the same. Sayu shook those thoughts out of her head. No, bad Sayu, you need to stay focused. She thought back to the possibility of Light being Kira.

Dad is the Chief of Police, so he would have access to all information involving Kira. He'd know how to work around the system. But… he'd have to hack to computer. Or join the in on Kira investigation! Sayu's eyes widened in realization as the truth sunk in. That's it! Light is working on the police force with dad! He'd know everything about what they knew of Kira… he's always one step ahead. Well… that's Light for you. Sayu smiled sadly as she brushed a lock of her long chocolate brown hair behind her ear. At least he hasn't lost himself completely but… he's still a murderer. Your own brother! He-he killed innocent people. I mean sure, some of them had made mistakes in their past, but haven't we all? And, what about the members of the police? He killed them! They didn't even do anything wrong! He killed them… just because they got in his way!

Sayu felt her eyes watering, and soon enough a tear slid down her cheek… followed by another… and another. Soon enough she was sobbing uncontrollably. She pulled her knees to her chest and wrapped her arms around them. A part of her wanted to believe Light was innocent, but the other told her that she knew that he was Kira, a cold, merciless killer. Sayu cried for a long time, until the fatigue finally became too much for her to handle, and she fell asleep, her eyes red and puffy.

Sayu awoke to the sound of her alarm clock blaring, signaling it was time for her to get up and ready for school. It was too early for Sayu especially since she stayed up half the night trying to figure out if her brother was a killer and the other half crying because she knew it was true. Needless to say, Sayu could already feel that this was going to be a bad day. But she got up anyway. She did her morning routine and got dressed in her favorite outfit, which consisted of a beige short sleeved turtleneck dress that ended slightly above her mid-thighs, that was over an orange long sleeve shirt and black leggings. She put her hair up in a high ponytail and walked downstairs for breakfast. Her mother was dishing up a plate for herself, Sayu and Light.

"Hi Mom, Light." Sayu greeted her mother and brother while she sat down at the kitchen table across from Light as her mother put down to plates in front of them.

"Something wrong Sayu? You're not getting sick, are you?" Her mother asked, feeling Sayu's forehead.

"I'm fine, just a little tired is all." Sayu said, playing with her food. She was too depressed about her brother to eat. "If you don't mind, I think I'm going to go to school early today." Sayu said getting up. She said a quick goodbye to her family and gave her mother a quick kiss on the cheek before she grabbed her bag and headed off to school. Her not being hungry wasn't the only reason she wanted to leave early. She didn't want to be around Light any more than she had too. She was afraid of another outburst like last night. But she still had so many questions she still couldn't find answers for like, how does Light kill as Kira? Why does he kill them? What does he have to gain from all this? Will he kill me?

Sayu sighed. All her life her parents have cared more about Light than her. Light was perfect. He had the perfect grades, perfect at every sport, perfect at talking to people, perfect at not embarrassing himself. Sayu had good grades, but they were never as well as Lights. She was good at some sports, but she wasn't good at all of them like Light was. She had friends, but she had enemies as well. Sayu also had her fair share of embarrassing moments. No matter how you compared them, Light ended up on top. No matter what she did, she'd always be second best. Always one-upped by her brother. And Sayu was starting to get sick of it. But finally, she knew something he didn't know she knew. She knew that he was Kira. But if she told anyone, would he kill her?

So, what did you think? This is basically a what if Sayu figured out Light was Kira? Again, this is my first fanfiction, so sorry if this idea is over used. I will get more creative, but it will take time. Anyways, don't worry. This is just kind of a prologue, there will be more dialog in the future, and it will be going deeper into the story. But some parts will follow the anime, just with some twists. But please review and tell me if you think I should continue or not? Because this just kind of came off of a random idea I just thought of. So, please review?