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