Just today, Tomonobu Itagaki announced that he is leaving and suing Tecmo over unpaid bonuses. He claims a completion bonus for Dead or Alive 4 has gone unpaid; further stating, "President Yoshimi Yasuda chose not only to violate this agreement, but also turned defiant, telling me 'if you are dissatisfied with the decision not to pay the bonuses, either quit the company or sue it.' " So far, Tecmo has yet to respond.
Tomonobu Itagaki (via his translator, Andrew Szymanski) has contacted a number of news outlets requesting prompt reporting of this story. This news arrives the same week as the release of the highly anticipated sequel, Ninja Gaiden II. This severance of ties to Tecmo ensures he likely won't be able to work on any future Dead or Alive or Ninja Gaiden projects.
Itagaki is most known for his work with Team NINJA where he created the Dead or Alive series and the modern reincarnation of the Ninja Gaiden series. He derives his success from incorporating 'fun' into his projects to ensure satisfying gameplay. Itagaki's cognizence of Western gamers' interests also allows his hits to become international successes instead of Japan-only treasures.