Shinobi no Ittoki (Alternate Title: A Moment of Shinobi) is an original anime series by TROYCA and DMM Photos. As the name suggests, the series is about ninjas.
The story focuses on Ittoki, a higher schooler who abruptly becomes an assassination target. He somehow saves himself but quickly realizes that he is the heir of the Iga ninja clan. The Koga clan desires to kill him, and he has to train to save his life.