Every day, around the world, the lives of some 150,000 souls are extinguished. Some pass away after long struggles with illness, heart attacks, strokes and heart failure. Others from hunger, injustice and disaster. But there are also those who find no strength to resist the cruelty of fate, choosing the path of suicide. Their souls, tormented by stress, depression and coma, become Nightmares - beings distorted by despair, wandering in search of peace between hell and heaven. To confront these shadowy creatures, humanity has created a special unit, the Nightmare Hunters. These brave warriors with unusual abilities wage an endless war against nightmares, protecting the world from their horror. Among them is Dirono Hanozakawa, an ordinary kid working outside the official structures. He accepts orders to destroy Nightmares, unaware that each of his missions brings him closer to his own demise. A hunter turned victim, Dirono must uncover the secret of his origins before the darkness consumes him whole...