Fumio Manaka ("Unsui") was 14 years old, when he first started training as the first student of Masaki Hatsumi Sensei. He has achieved certificates of mastery (menkyo kaiden) in several martial schools and a has a formal training in many others.
Manaka Sensei lives in Noda-shi (north from Tokyo) in Japan and teaches students at the Jinenkan Honbu Dojo headquarters and also travels worldwide to give seminars, workshops and private training to ensure that students around the world can participate in Jinenkan training.