Rescued from nearly drowning in a river, a young Chidori yearns to pay back her savior's kindness. Though her cute and innocent appearance might not show it, she is actually a highly skilled ninja, so years later, Chidori and her friend Sukezou come to serve under the man who saved her—the ambitious warlord, Nobunaga Oda. As Nobunaga fights off invading forces and sets his sights upon neighboring lands, Chidori is assigned vital tasks to assure victory, such as gathering information or assassinating key figures. Between taking on these important missions and dealing with the colorful cast of Nobunaga's family and servants, the young ninja is always ready to do her best to lead her master toward greatness.

Who cares about what happened in Japan's past? It has nothing to do with my life. With these words, carefree high school student Saburou finds himself unceremoniously thrown back in time to the Sengoku Era, landing directly in front of the legendary general Nobunaga Oda. Nobunaga, on the run from his retainers and wishing to rest due to his frailty, beseeches Saburou to take his place, as the two bear an uncanny resemblance. Although Saburou is still confused by his surroundings, Nobunaga hurriedly provides the boy with the necessary items to prove that he is the bona fide feudal lord and makes a hasty getaway. Now a stand-in for someone he doesn't even know all that much about—though his modern experiences and knowledge are sure to help him—Saburou begins his unexpected quest to pose as the man who attempted to unite all of Japan.

In the war, a group of warriors called Ninku fought against the Imperial Army and almost annihilated it. But in the end, the Ninku lost and got shattered. After the war, the imperial army established themselves as the defender of the people with the help of propaganda. They also managed to get the people to think the Ninku were the villains and had started the war. Fusuke looks like a child but he is the former captain of the first Ninku division. His mother was taken during the war and after the Ninku were defeated, he goes on a journey to find her. On his journey he meets Aicho and Touji, both also former Ninku captains, and together they fight against the imperial army that tries to kill the last remaining Ninkus. The ninku is a clan of extinct ninjas who command esoteric and powerful techniques, hence a lot of other groups are constantly trying to steal their techniques to take over the country. Their primary target is Fusuke, a weird looking kid but one of the most powerful Ninku ninja. Fusuke, together with other Ninku ninja with different specialties must fight those threat that caused the downfall of the Ninku clan. (Source: ANN)