Tomonobu Itagaki, renowned producer of the “Ninja Gaiden” series and head of Tecmo’s Team Ninja, has resigned effective July 1, 2008 — obviously timing his announcement to coincide with the release of “Ninja Gaiden 2,” Team Ninja’s latest contribution to the action/adventure genre of the video game industry. Itagaki is currently suing Tecmo for US$1.4 million — the amount he claims he’s owed as a production bonus for “Dead or Alive 4.” His parting of the ways with Tecmo has many Team Ninja fans wondering if the “Ninja Gaiden” and “Dead or Alive” series will continue or simply vanish.