Togakure-ryū Senban Shuriken

Togakure-ryū (戸隠流) is a historical tradition of ninjutsu known as the "School of the Hidden Door", allegedly founded during the Oho period (1161–1162) by Daisuke Nishina (仁科大助) (a.k.a. Daisuke Togakure (戸隠大助)), who learned his original fighting techniques from a Chinese monk named Kain Dōshi.

To the right in the picture is Soke Dr Masaaki Hatsumi, the 34th Grandmaster of Bujinkan.