Manga adaptation of the Yagyuu Ichizoku no Inbou movie / TV series.

One day, Takechiyo, the eldest son and heir to the third shogun, Iemitsu, was attacked by a group of Negoro ninjas. Why would the Shogun's own secret service target the heir to the Shogun's throne? Seven samurai, including Ishikawa Gyobu, a powerful swordsman who is Takechiyo's personal guard, confront the band of assassins, each using his own special skills. The clash between the seven samurai and the band of assassins grows more intense with each battle......