Maria Won is revealed to be the attacker responsible for the Nagasaki attacks, however her life after death was not without the helping hand of another. As it becomes clear that the mysterious Dr Muraki is involved in the supernatural goings-on, Tsuzuki learns that Maria Wong is not the only one he should be concerned about.

A request from the Count himself leads Tsuzuki and Hisoka to the Queen Camellia cruise ship to investigate its ties with the mysterious longevity of a number of people who were due to die. Once on board, Hisoka finds himself drawn to Princess Tsubaki, the daughter of the ship's owner, while Tsuzuki is horrified to discover an old accquaintance alive and well. As one of the passengers is killed, suspicions turn to all directions but Tsuzki and Hisoka have one particular suspect at the top of their list.

Wracked with guilt after Maki's death, Tsuzuki and the others take up jobs at Mariko's high school in order to protect her, however she is terrified that the Guardians of Death actually want her dead. Meanwhile Muraki, intent on using Tsuzki's body to take revenge on his own step-brother Saki Shudo, will do anything to claim his prize, even putting more innocent souls at risk.