In an age where one in twenty people develops special abilities, Hiroto Takigami, a weakling who can only talk to spirits, is hated by his powerful stepsister, Rei, for a reason unknown. She will kill him the moment Hiroto graduates from the institution for ability users and gains the freedom to control his abilities. She tells him that his “remaining time” is one year. Lost in despair, a spirit appears before him, revealing an unbelievable secret about the true nature of his ability. Thus begins an unprecedented "body hacking" battle.