Yuu☆Yuu☆Hakusho

A 14-year-old boy known for his rebellious and violent behavior ditches school and gets into frequent fights. After saving a child's life, he dies and becomes a ghost. The afterlife authorities, led by Koenma, were unprepared for his sacrifice and assign him to work for Koenma in place of a traditional afterlife. Yusuke helps combat demons that endanger humans by stealing valuable objects or causing destruction. He is often accompanied by Kuwabara, a local bully and his rival, as well as two escaped demons, Hiei and Kurama, who were once convicts in the afterlife. Together, they face battles that have significant consequences for humanity.