Sensei Arie van den Akker was a known martial arts master in the art of Kuroi Ryu Ninjitsu. As a student of sensei Andreas Leffler from Kampfsport Dachau Odelzhausen he learned the martial arts of the ninja. Sensei Arie van den Akker was the founder of the Black Dragon Society Holland Shinobi Iri Dojo in 2003 and also the founder of the Kurokumo Bushido Academy Groningen.