Cory O¿Neil is a lonely and shy 15 year old boy who is about to start the school year in Madrid, far from the bullying he suffered in his former school. His entire life changes when he meets a group of boys his same age capable of turning into monstrous warriors, called oniricees, asked for his help to restore the broken horn of the Great White Unicorn. Since then, wonderful and tragic events will cause Cory to find his true origin and hidden powers previosly unknown.