In the Age of Great Pirates, Devil Fruit is the key to dreams and the shackles of destiny. Among all fruits, the Dark Fruit is regarded as the weirdest and most taboo existence - it can swallow light, absorb damage, and even deprive others of the fruit's ability. However, it also makes the person with the ability suffer more severe pain than ordinary people, and is called the "Devil among Demons."
The young Rez lives on Kirigakure Island on the edge of the East China Sea. There is a legend about the "Black Ghost" circulating on the island. By chance, he touched a black crystal that exuded a dark atmosphere in the forbidden cave in the center of the island. From then on, he developed a mysterious connection with the power of the Dark Fruit. He has not fully obtained the fruit's ability, but he can sense the "darkness" around him - not only the physical shadows, but also the desires and malice deep in the human heart.
As the Navy's search for Kirigakure Island becomes increasingly strict, Reitz discovers that the legends on the island are closely related to the secrets of the World Government, and his own power is the key to uncovering it all. In order to protect the islanders and to find out the truth about power, he took the old logbook left by his adoptive father and set sail with a group of partners with different personalities.
Along the way, they encountered pirates who coveted the power of darkness, fought against special naval forces that performed secret missions, and saw the trajectory of their predecessors who were destroyed because of the Dark Fruit. Rez gradually gained control of his power in battle after battle, but he also constantly faced the test of being "swallowed by darkness". He discovered that the real secret of the Dark Fruit was not only related to the ability itself, but also involved the blank 100 years of history and the mission of the D family.
