The main character of the series, he starts out as a juvenile delinquent who is very good at fighting with his bare hands. After he gets hit by a car and is killed, he eventually comes back to life after a series of tests/events. Because of this, he is a Reikai detective, and Koenma shows him how to focus his reiki and use his reigun. Then after winning a competition, he becomes Genkai's student and learns how to control his reiki and learns all these other cool moves.