The mysterious ninja village of Manma... Its leader was attacked and killed over the "Ninja Treasure Scroll," which contained the location of a million-ryo treasure. The key to solving the mystery of the Ninja Treasure Scroll lies with the leader's daughter, Shion. Burdened with a harsh fate as a "kunoichi" (female ninja) of Manma, Shion sets out on a journey with revenge and the mission to solve the mystery in her heart. Ninja armies bare their fangs one after another wherever she goes...