Light's sister, Sayu Yagami, misses her older brother. One day she finds a notebook looking similar to the Notebook of Death except it was white and had the words "Life Note" written on it. After finding out how it works, she brings Light Yagami back to life. As soon as he is brought back to life he begs his sister to bring Ryusaki aka "L" back to life but why? Why bring back an "enemy" to life when you can continue life without them? Is it because Light has feelings for him?