Yusuke Urameshi, a bad boy from Sarayashiki Junior High School, has nothing to do all day, either quarreling with his childhood sweetheart Yukimura Hotaru, or taking out his anger on his mortal enemy Kuwabara Kazuma. One day, Yusuke, who was skipping class to play, saved a little girl from under the wheels, and was hit and killed by a car. His actions were beyond the expectations of the spirit world, so he got a chance to resurrect. After repeated tests, Yusuke finally returned to the human world with the help of Hotaru and Kuwabara. After that, he became a spirit world detective, specializing in various strange crimes. During a mission, Yusuke met Kurama, a demon fox under the alias Minamino Hideichi, and Hiei, a thief. As the saying goes, you can't get acquainted without fighting. Yusuke, Kuwabara, Kurama, and Hiei became partners who advance and retreat together. Together, they participated in the dark martial arts conference where powerful monsters gathered, and fought against the terrifying Toguro brothers. This was the beginning, and since then, their entanglement with the demon world has become deeper and deeper, and the battle has become more intense...