Sidoh's Death Note

Sidoh's Death Note is the first Death Note seen in the series, and the first notebook used by Light Yagami. This Death Note would ultimately change Light's life forever, turning him into a serial killer who targeted criminals.

Appearance
The notebook has a black cover with the words Death Note written on the front. Inside are white ruled pages. The inside of the Death Note contains the basic rules of how to use it, which are written on the back of the notebooks cover. These rules were added by Ryuk, and were not originally present inside the notebook when Sidoh owned it. Light later asks Ryuk to write fake rules in the Death Note.

The Rules
The five rules written by Ryuk are as follows:
 * The human whose name is written in this note shall die.
 * This note will not take effect unless the writer has the subject's face in their mind when writing his/her name. Therefore, people sharing the same name will not be affected.
 * If the cause of death is written within 40 seconds of writing the subject's name, it will happen. 
 * If the cause of death is not specified, the subject will simply die of a heart attack.
 * After writing the cause of death, the details of the death should be written in the next 6 minutes and 40 seconds (400 seconds).

Fake Rules
Light makes some small additions to the rules of the Death Note. He has Ryuk write them on the inside back cover of the notebook. This allows Kira to stay one step ahead of L, then ultimately defeat him outright.
 * If the owner of the Death Note does not write a name in it for 13 days, consecutively, he or she will die.
 * If the Death Note is burned or destroyed, all who have touched it will die.

Plot
Sidoh's Death Note was stolen in the Shinigami Realm by Ryuk, who wrote the rules of how to use it inside the notebook, and dropped it into the Human World. The notebook was then found by Light Yagami in the courtyard of his high school in Kyoto, Japan.

Later in the story, Light gives this notebook back to Ryuk, who gives it to Rem, who was instructed by Light to give it to a greedy human who would use it for his own gain. It was given to Kyosuke Higuchi by Rem. After Higuchi gets captured by L, the Death Note ends up in the hands of the Japanese Task Force.

Soichiro Yagami later trades the Death Note to the Mafia, who kidnap Sayu Yagami and ask for the Death Note in exchange for her life. The Death Note was then given to Jack Neylon by Mello.

The Death Note is recovered by the Task Force and given by Light to Sidoh, who takes it back to the Shinigami Realm.

Trivia

 * Each volume of the manga has pages which contain new rules or possible uses for the Death Note. In the anime series, each eyecatch contains a different rule written in both English and Japanese, similar to how they were revealed in the Japanese manga. Two new rules are revealed in almost every episode of the anime.