The Kouga Ninja Scrolls

In 1614, the long-standing truce between the Kouga and Iga ninja clans is broken when each side is ordered to select ten warriors for a deadly contest that will determine the succession of the Tokugawa shogunate. Caught between the rival clans are Gennosuke of Kouga and Oboro of Iga, heirs who had hoped their marriage would finally bring peace between their people.