Joko Ninomiya was a student under the late Ashihara (who left Kyokushin and started Ashihara Karate). After Ashihara passed, Ninomiya would later start Enshin Karate. This system is based on Sabaki. Sabaki uses circular motion to avoid force and move to an opponent's blind spot. For over 30 years, Ninomiya has hosted the Sabaki Challenge, a bare knuckle full contact karate event featuring fighters from all over the world.