Feature-length US theatrical release to promote the TV series Basilisk: Kôga ninpô chô (2005). The film was made by combining the first four episodes of the series.

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.