The Death Note is the titular book from the Death Note series. This book is originally designed to be used by the Shinigamis as a way to preserve their life. The way the book works is that when someone’s name is written in it, they will soon die. One such death note winds up in the hands of Light Yagami after Ryuk (a Shinigami) dropped the book out of boredom. This spells the start of Lights tyranny of death upon all he deems unworthy.