Miharu Rokujou drifts through school determined to care about nothing and no one. That ends when his teacher Tobari Kumohira and his classmate Kouichi Aizawa reveal themselves as ninja from Banten and tell him his body holds the Shinra Banshou, the most coveted secret art in the hidden ninja world of Nabari. Rival clans converge to claim the power sealed inside him while Kumohira keeps pressing him to join the school's nindo club. Miharu is forced to decide what to do with a power he never asked for.