The bright-pink ninja-emblazoned train isn't exactly the epitome of stealth as it cuts through the forested hills and rice paddies of Mie Prefecture. Neither are visitors' pint-size offspring who race excitedly up the paths of Ueno Park in the city of Iga shrieking their excitement at the prospect of getting up close and personal with fun and fear in the shape of Japan's famed spies and assassins of history and legend.