Triggered by a whispered word, a seemingly ordinary student transforms into a ruthless killing machine, caught in a deadly game between corporate espionage and the powerful world of shinobi.

Forced to trade his cybernetic enhancements for chalk and a classroom, a stoic cyborg ninja finds his mission to train naive teenage shinobi complicated by simmering rivalries, budding relationships, and a rising threat that will test his own warrior code.

In a world where the good and evil clashed against each other, one enigmatic figure doesn't take sides and only care about protecting the innocence from the threat of the monsters as he smite them without mercy. He is unknown and all that he is known is his Holy Sword.

Mai is a new student at Hanzo Academy and upcoming shinobi. Hoping to run away from her horrible past and actions that will instantly label her as an evil shinobi on the spot. Just when she thought she had finally put her past behind her. A mysterious person uncovers it and uses it to blackmail her. Can Mai find out who is this mysterious person is and take them down? Or will the