In the eyes of the general public, ninjas do not exist. In reality, even if their existence would not be totally unfounded, they would never reveal themselves to normal people. It is for this reason that they are considered to be just a myth. Sakuraba Ittoki is an ordinary young man. He leads a normal, happy life, until the day he is the victim of an assassination attempt. Very quickly, he learns that if he has been targeted, it is because he is the descendant of a famous clan of ninjas, that an opposing clan is trying to make disappear. No choice for Ittoki, to have a chance of surviving against his attackers, he will have to learn to fight, in order to, too, become a full-fledged ninja!