17 years ago, immortals appeared on the battlefields of Africa. Later, rare, not known new immortal life forms began appearing among humans, and they became famous as"Ajin" (demi-humans). Just before summer vacation, there is a Japanese senior high school student killed in a traffic accident on his way home from school. But he is revived, and a price is set on his head. Thus begins a boy's life on the run out of each of humankind.