Death Note Fanfiction: Fallen Leaves

In her previous life, she was an assassin. The only person she could rely on, her younger sister, also died by her hand. He approached her to avenge her sister, and finally killed her with his own hands, only to realize at the moment of her death that he loved her. The Black and White Impermanence lost her soul's summons, so the King of Hell had no choice but to send her to the world of the Grim Reaper. As she passed by the Bridge of Helplessness, she seemed to see his figure...