Sidoh is the Shinigami whose Death Note was stolen by Ryuk. By the time he realizes this, however, the note has already changed hands several times, ending up in the hands of Mello's gang (more specifically, Mello's subordinate, Jack Neylon whose real name is Kal Snyder). After repeatedly hounding Ryuk for its return, he tracks down the gang to get it back. He discovers his notebook is in Los Angeles, California and upon arrival takes the notebook out of Mello's hands (making it look as if it just floated in mid-air) and touches it to the notebook's current owner, Kal Snyder (a.k.a. Jack Neylon). After Snyder freaks out, he gets Mello and the others to touch the notebook. To regain his Note, Sidoh agrees to help Mello's gang against Near's SPK and the Kira investigation team. Snyder is forced to make the eye trade with Sidoh, who exposes the fake 13-day rule.