Shinobi no shu

When a team of ninja is sent to kidnap Lady Oichi, the sister of the late Oda Nobunaga and wife of Shibata Katsuie without harming her, they must find a way into the fabled Iron Castle at Kitanosho, and a way out as well. Facing impossible odds, the team finds their skills tested as they risk their lives to accomplish "Mission: Iron Castle".