A fourteen-year-old delinquent boy, Yusuke Urai, was hit by a car while trying to save a child. Since the spiritual world did not expect his death and there was no place for him, he was reborn. Chance. After being tested in the spiritual world, Yusuke finally returned to his body and became a detective in the spiritual world.
During a mission, Yusuke met Kurama and Hiei, and the three of them, together with Kuwahara (Yusuke's best friend), solved a lot of cases for the spirit world. Then defeat powerful opponents in the "Dark Martial Arts Tournament", and their strength and friendship grow day by day.
