Matsui =family name, Kenji = first name, (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.
2002: holds lectures at Black Heart.
2004: holds bondage seminar at Black Heart with Denki Akechi.
2013: dies from diabetes on Jun 8 2013.
Remained anonymous while tying for SM magazines and books (for example, "Oarutsurinohon").