Girls attend academies for contemporary shinobi. They devote their entire youth to mastering the art of true shinobi, sparring relentlessly to refine their abilities. Then one winter evening, Asuka—descendant of a famed shinobi grandparent—meets an ancient malevolent force called a 'Youma' in Tokyo's hidden lanes during Christmas. Where light shines, darkness follows. More than twenty-eight of history"s most powerful and formidable ninjas, both righteous and wicked, will clash in a fight that decides genuine justice for the realm of honor and destiny. This lethal confrontation starts now in the shadows of night.