Yu-Yu-Hakusho Ghost Files: Spirit Detective takes the player from Yusuke's early and unexpected demise to his revival and first couple of missions as the Spirit Detective.
Yusuke Urameshi is one of the tough kids in school -- he doesn't have good grades and he constantly gets into fights (especially with his self-proclaimed rival Kuwabara). So no one expected him to save a little boy from being hit by a car. When death herself (a girl named Botan) comes to collect Yusuke and confesses that no one expected his courageous actions, he is given a chance to reclaim life.
When the young tough guy comes back to life (an adventure in itself) he is hired by Koenma (the prince of Spirit World) to become the newest Spirit Detective. As Yusuke grows in skill, he joins up with one time enemy, Kuwabara, and later two other demon bandits, Hiei and Kurama.
Unfortunately, if you aren't already familiar with the storyline of the show, you may find yourself more or less lost when characters pop up out of nowhere in Spirit Detective.
You will have control over each of the main characters (Yusuke, Kuwabara, Hiei and Kurama) as well as Botan and Yusuke's girlfriend, Kayko, during certain key times in the story. Except for the two ladies - your characters will level up as they defeat enemies and collect energy. As they grow stronger, they will learn their signature moves from the show. Yusuke will gain control of the Spirit Gun and Spirit Shotgun, while Kuwabara's Spirit Sword will become available. The two demons will start off with some of their powers - but even they will learn new moves as you progress.
One of the problems I found with Yu-Yu-Hakusho is the amount of running you do across the fairly large sized maps. I found that after a few minutes of pressing one direction on the D-Pad, my hand would start to cramp up. But at least the game gave me plenty of reasons to run across these maps. Most of the time you are charged with missions like 'find all of Kuwabara's homework' which is scattered all across the city. So you may find your hand cramping up on a regular basis.