If the happiest wish in the world is eternal life, it is also the most painful one. God may be a boring guy who created a group of immortal witches and gave them eternal life. It's just that this eternal life comes at a price - fighting each other once in a hundred years. Only a witch can stand in the arena like ancient Rome and get a wish. Can they really accept this fate of being at the mercy of others?
Concept: Are immortal girls really still human beings?
