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Oda Nobunaga saves a girl from drowning one day. She clumsily tells him that she's a shinobi. Instead of attempting to kill him, she swears to serve him one day after hearing his plans to unify Japan. (Source: Crunchyroll)

Third season of the Nobunaga no Shinobi series.

A skilled, deadly ninja on the clock and an adorable, naïve girl off it, Chidori continues to pave the way forward for her master, Nobunaga Oda, in his conquest of the Land of the Rising Sun. Though Nobunaga has made great progress in his quest, uniting a nation has not become any easier. Between vindictive former enemies and powerful new rivals, his stubborn adversaries have taken up arms to stamp out the warlord's ambitions. However, standing beside the ambitious general are his many close friends and supporters, including one loyal, capable shinobi. Ready to serve in whatever way she can, Chidori gathers key allies, infiltrates enemy castles, and duels against skilled warriors in the name of realizing her lord's dream: establishing a unified Japan. [Written by MAL Rewrite]

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. [Written by MAL Rewrite]