They say that once in a lifetime, people meet their alter ego, doppelgangers, Other personas and the such in their dreams. There, they are questioned, and only those who satisfies the other persona's whim will be given an opportunity. They will be given a 'Talent', a special ability that brings out 120% of the person's potential, in exchange for half their life. It means that when a certain time comes, the alter ego will be taking over the person's body, in exchange for the 'Talent' they will wield. People who don't satisfy the alter ego will be left as normal and will never be given this life changing experience.