While vacationing, Koenma is kidnapped by a pair of demons known as Koashura and Garuga, who demand the possession of Lord Enma's coveted "Golden Seal." Botan finds Yusuke Urameshi and Kazuma Kuwabara on their summer vacation as well, and asks for their assistance in Koenma's rescue.

When the Spirit World is flooded due to an unusual rainfall which overflows the River Sanzu (aka the River Styx), Lord Koenma senses an extremely powerful enemy. He entrusts Death God Botan, to deliver to Spirit Detective Yusuke, a mysterious item which must be protected from the invading enemy. However, by the time Botan finds Yusuke, she's too weak to explain the situation. Yusuke and his friends are left in the dark about the new enemy, but not for long. Soon it is a battle for Earth between mere Spirit Detectives and the almighty king of the Netherworld.

A delinquent teenager is killed in a car accident, and is resurrected as an investigator of the supernatural.

Yusuke Urameshi, revived as a spirit world detective, defeats the evil monsters that appear one after another with his reliable friends Kuwabara, Kurama, and Hiei in order to protect peace between the human world and the spirit world. In front of them, a formidable enemy stands in their way... The battles gradually become more intense as the stages change from the human world to the spirit world to the demon world, and what lies ahead as the story deepens...

Two recap specials that focus on Team Urameshi's matches in the Dark Tournament and four separate volumes focusing around one of the main characters; Yusuke, Kurama, Hiei, or Kuwabara.

Two Shots adapts the extra chapter of the same name, while All or Nothing adapts Chapter 174 of the same name and a scene of the final chapter of the manga, which also matches with the conclusion of the final episode of the anime series. Two Shots tells the story of how Kurama and Hiei met, while All or Nothing covers a story of the main characters coming back together to solve a hostage crisis in the spirit world.