On the way home from school one day, Konoha Koga rescues Satoko Kusagakure, a ninja who escaped her village. Soon, pursuers from the village show up in search of Satoko only to be deftly dealt with by Konoha. As it turns out, the unassuming high schooler is actually an assassin. Thus, the potentially cutthroat cohabitation of a ninja and an assassin begins!
 
(Source: Crunchyroll)

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The story of Ninja to Koroshiya no Futarigurashi follows Satoko Kusagakure, a naive ninja who escapes from her village and is saved by a passing high school girl, Konoha, when she collapses in the city. Satoko's pursuers close in, but much to their and Satoko's surprise, Konoha holds her own against them — since her true identity is that of an assassin.
 
The start of an unpredictable life together between ninja x assassin. 
(Source: Crunchyroll News, Dengeki Daioh G, edited and translated)