Matsui =family name, Kenji = first name, (male, 1940s-June 8, 2013)
松井健二 (Japanese), Mr. MA
Born during the 1940s.
1990s, first named in bondage work for SM magazines and books.
Autumn 2002, holds lectures at Black Heart.
c.July 2004, holds bondage seminar at Black Heart with Denki Akechi.
Jun 8 2013, dies from diabetes.
Jubei Kamui is greatly influenced by and directed by Kenji Matsui as adviser of Mumonbaku.
Remained anonymous while tying for SM magazines and books (for example, "Oarutsurinohon").