The Demon War

A group of races (Angels, Demons, Vampires, etc.) who were living in peace and harmony. One day, the demons suddenly begin to betray the races which cause a whole battle. Races go against each other until the angels won and wish for harmony again. There is harmony, but some of the races still don't like each other. There's a school which teaches the races harmony, love, and their powers. This one angel boy was bullied by a group a race, but a couple stopped the bullying and they become friends. But, will it still stop the races going against each other?