Miharu Rokujou desires nothing more than a quiet, uncomplicated existence. Sadly, he discovers that he possesses the ancient and confidential ninja art known as the "Shinra Banshou." This unique skill grants him greater chances of becoming the ruler of Nabari, a concealed realm, than remaining an ordinary high school student. To make matters worse, he must endure daily assassination attempts and, paradoxically, his teacher's attempts to persuade him to join the nindo club.
The possession of this seemingly all-powerful ability will test Miharu's survival skills, and the fate of the world of Nabari rests on his shoulders. Will he ever attain the simplicity he yearns for?