Japan Karate Do Ryobu-Kai (JKR) of New England is part of an international martial arts organization with branches in more than 20 countries around the world. Japan Karate Do Ryobu-Kai (JKR) teaches a form of traditional karate called Shindo Jinen Ryu, which has roots that reach back to the 16th century. Shindo Jinen Ryu is one of the original Japanese styles of karate, and one of the very first to be recognized officially.