In 1614 AD, the 19th year of the Keicho Era, wretched deep within the Edo Castle, loyalties lie in a twisted socio-political tangle. In penitent disarray, the rooted partisan siding with Hidetada's heir and first-born, Takechiyo, fear the untried insurgence backed by those devoted to his younger son, Kunichiyo. If this treacherous rupture goes unresolved, the whole Tokugawa kingdom will be torn apart, leaving the high-priced samurai to battle for a new heir. But, Lord Ieyasu won't allow the Tokugawa samurai to perish when mutant ninja's can be spared at no expense.