The gag manga centers on a young female ninja named Chidori, whose dream is to help the Warring States-era warlord Oda Nobunaga to achieve his goals.
 
(Source: Anime News Network)

This 4-koma manga follows Chidori, a little ninja girl in Sengoku Japan (the Warring States Period). One day, Oda Nobunaga himself rescues her from drowning in a river. Since that day, Chidori knew she wanted to serve Nobunaga. 5 years later, she and Sukezou (who likes her) head out from their ninja village, determined to serve Oda Nobunaga! 
(Source: Mangahelpers)

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)

The second season of Nobunaga no Shinobi.

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