In my opinion, it is win and awesome in it's purest form. The perfect mix of action, comedy, thriller, and drama.
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However, no one expects a sudden act of heroism on his part: he dies trying to save a little boy from a speeding car. In fact, when he arrives in the afterlife, he is informed that no one was expecting him to die that way, and were not prepared for his arrival.
After numerous tests to gauge his worth, Yusuke is eventually revived, and is assigned to work for the Spirit Realm as a detective investigating demonic cases in the human world. He comes into spiritual abilities of his own, and enlists the help of numerous friends from Reikai (spirit world), Makai (demon world) and Ningenkai (human world) to aid him in his cases, and fight off demons and humans seeking to usurp and rule over all three worlds.