Light Yagami came home from school one day to find his little sister busily at work at the kitchen table. And, not, evidently, on her homework.
He plucked a paper from the stack beside her, ignoring her protests. Drawings, not bad, actually, of strange winged monsters and police. "What's this?"
She grinned up at him. "Character designs! I'm going to be a manga-ka when I grow up."
"Of course you are." This was the first he'd heard of it. It didn't surprise him at all; Sayu had always been fairly flighty- or maybe Light had always been unusually serious. "So what will your debut story be?"
"Well, there are Shinigami who live in a special world and have notebooks that they kill people with-"
"They kill people with notebooks." How, by hitting them over the heads with them?
"They write your name in it, and you die. And then one of them drops one into the human world, and a kid picks up the notebook and does something evil with it." At his odd look, she explained, "I didn't think that far ahead yet."
"Of course. I see. And why does this kid look like me in three years?"
"I'm bad at drawing high schoolers! Aren't you happy to be a main character, Light?"
"Not if I'm a villain-" She spluttered a little at that- "and don't tell me that 'doing something evil with it' doesn't make a character a villain."
"What if they have really good motives?"
Was it possible to be that naive, or was his sister just being her usual (annoying) self. Sighing, the eighth grader replaced the sheet of paper. "It's very nice, Sayu."
"Really, d'you think so?" Like that, she was cheerful again. His sister never ceased to amaze him.
"Yeah, sure. Now do your homework."
"But I'm working! I can't stop in the middle of it."
"Oh, yes you can. Homework."
"Fine." Sulky, she started to take her work out, sweeping her papers to one side. Light turned to go up to his room.
"Light, what would you do with a death notebook?"
He stopped without turning around in the middle of the doorway. "Why would you ask that?"
"Well, the main character looks like you. Besides, I can't think of anything Seriously, Light!"
Another sigh. "I'd use it to eliminate evil from the world. I don't know, Sayu. Just do your homework." And with that he trumped upstairs to start on his pointless schoolwork, shaking his head at his ridiculous sister.
He would remember that later, and laugh.