Unsui Sensei has over 50 years of experience in the Japanese arts of kobudo, having started training at the age of 14 as the first student of Masaaki Hatsumi Sensei. Unsui Sensei holds certificates of mastery (menkyo kaiden) in several martial schools and has formal training in many others. In 1996, Unsui Sensei founded the Jissen Kobudo Jinenkan.

For many years Unsui Sensei has made regular trips to the United States to conduct training seminars and to directly instruct his students. From April 2001 to May 2004 Manaka Sensei lived and trained in Baltimore, Maryland. His goal in this move from Japan was to allow martial artists in the United States and Europe easier access to him and to raise the level of training in these areas. With his goals achieved, he returned to Japan in June 2004. He continues his tradition of annual seminars in the U.S. and Europe.