Ok this is what happened to the Death Note before it became Light’s. I had some help with the main idea from a friend.

Mellow looked in the mirror at his reflection scowling back at him. It was Saturday, and most of the children in the House were out going about their own business. Near had gone to the toy store, Matt disappeared into a Game Stop near the House, Soji disappeared into a jail called a bookstore , and Ryuza went to the gym. There is nothing to do! Mellow sighed.
Mellow washed his face and went into the kitchen. It was only nine in the morning, but it was completely empty. Well I could always get some chocolate. Mellow thought happily. Mellow opened the refrigerator and felt shock run through him like the blast of cold air that had slapped his face. There was no food in the fridge! Roger must have gone out to go buy more food.
Mellow walked out of the House and into the fresh air. It was a spring day, but the temperature made it feel like summer. Venders and children crowded the streets. Mellow stared out and proceeded down the street. From across the street, Mellow could see Matt playing one of the free trials of a game displayed near the window. Mellow thought to go get him, but then stopped. Matt is happy. There is no reason to make him suffer boredom with me.
Mellow continued down and spotted Near’s toy store. Near was nowhere in sight, so Mellow moved on. Soji’s bookstore was coming up, and this time and Mellow stopped and walked inside. The cool air was nice. Soji was reading something near the back about the configuration of cells in a body. Behind her unknown to any of them at the time was Mikami reading about law and order.
“Hey Soji!” Mellow called. The entire bookstore looked up at him and told him to shush. Mellow though of a few choice curses to use but dismissed them when he saw the look Soji was giving him. The expression of the “eyes of death” was written by William Shakespeare that Mellow had been forced to read in class. Now he understood the “eyes of death.” These were the eyes Soji was giving him at the moment. Mellow walked towards her despite his constant protest from all of his nerves.
“Mellow, what do you want?” Soji hissed angrily.
Mikami who had been watching the entire procession was trying to keep a straight face and was failing. This girl was very mad, and she was going to release it all here in a private showing. Now if only God would let me see these shows more often. Mikami thought. (This is before Light finds the Note, but Mikami still believes in God to a high exstent.)
“I was just board, and….um….,” Mellow had lost his words in a drain of mumbiling.
“You could get me kicked out of here!” Soji hissed under a smile of kindness. The contrast between her features and her voice are scary, Mellow thought.
Soji grabbed a black book from the shelf behind her not looking at it and threw it at Mellow with the force of a base ball pitcher. K.O. by Soji, Mellow dazedly fled the premises.
“Wait!” Soji called. Mellow had taken the black book with him. “Baka,” Soji swore.
“Miss? Are you going to pay for the book that man just took?” a cashier asked.
“Um…what book was it?” Soji asked.
“It is an old title by a person called Ryuk. There was only one copy put into circulation, and it has been in here for a long time. It’s called Death Note. It is only fifty yen. Are you going to pay for it?”
“Fine,” Soji sighed, handed over the fifty yen, and sat back down in her spot. Teru Mikami bought his law and order book and exited the bookstore.
Mellow ran blindly through the streets until he was out of breath and had to stop. It was at that time that Mellow realized that he had a book in his hand.
“Death Note hu? Is this the book that Soji threw at me? Well I have nothing better to do, let’s take a look inside,” Mellow sighed. His lips moved with the words written in the book, “the human whose name is written in this Note shall die. This Note will not take effect unless the writer has the face of the person in his or her mind when writing the name. What is this crap! Stupid book! And after that it’s blank. What do they expect? Do they think I’d actually kill someone? That is so stupid! I wonder if I could trade it to someone for something.”
Looking around, Mellow realized that he had run all the way to Game Stop. Matt was still playing in the window, and as his score continued to escalate, people were gathering to watch. Mellow pushed open the door and was flooded with cheers as Matt broke the previous record. Someone had gotten him a cigarette, but it stayed pressed against Matt’s lips unlit.
“Tobacco chewing,” Mellow sighed. It was Matt’s new way to stop smoking. He had tried so many times before to stop smoking, and this was his final straw. As Mellow pushed his way through the crowd, Mellow was pushed up against a man watching Matt play.
“Hey! Watch it! You can’t just bump Hiro Kazame and get away with it!” the man said angrily.
“Shut up f****r,” Mellow growled back.
“What did you just say?” Hiro yelled.
Remembering the Death Note, Mellow got out the book and proceeded to write the man’s name down. It was just meant as a shock to the man, but when Mellow finished and showed the note to the man, Hiro screamed and ran out of the building. Little did Mellow know that Hiro Kazame died that day half a block away.
“I knew this thing really didn’t work,” Mellow said aloud, “Hey Matt! Time to go home!”
“Fine,” Matt said, stopped, and put the game controller into the hands of a child no more than ten. “Go for it kid,” Matt smiled. Later in life that boy would grow up to be a professional game designer bound and determined to push the limit of gaming as Matt had done. As they walked out of the Game Stop, Mellow threw the Death Note to the ground and stepped on it.
Teru Mikami stared at this interesting book. He had been walking down the street when he saw the loud blond haired boy from earlier. This must be the book that the girl threw at him. Let’s take a look inside. Mikami read the rules and nearly laughed himself to death. There was no way any of it could be true. Only God could do that! He is the judgment of the world. Mikami walked a little ways past a toy shop and left it on a side bench.
Near stared out of the confines of his self-entwined prison. Several of his trains were going at once, but it was becoming boring now, and so he stood and walked out of the toy store. His clothes were not pajamas but still comfortable clothes. He walked a little ways back to the House when he saw the Note.
“Death Note,” Near read, “That is stupid and terrible. It deserves to be thrown off one of those skyscrapers.” Near smiled at his thought and began his trek to the closest skyscraper. Coincidentally, the nearest skyscraper was the Yotsuba building. Near got on the elevator with several eyes staring at him coyly. He reached the top and threw the Note off the building.
The Note fell farther and farther to the ground, but it was stopped by a flying shinigami named Ryuk.
“What the hell?” Ryuk asked, “It’s my Note! I’ve been looking for it! Crud, I though looking for my Note would be more fun. Maybe I’ll let it fall and wait five days. If nothing happens, then I’ll go steal more apples from those idiot farmers. (Actually at that time there was an apple famine in the U.S.) Hopefully it will be more fun. Well, later Note!”
Ryuk threw the Note once again into the human world where it would be later found by Light Yagami.