In the same statement announcing his resignation, he also announced that he was filing a lawsuit against Tecmo president, Yoshimi Yasuda, over unpaid bonuses for his work on Dead or Alive 4 for the Xbox 360. On June 3, 2008, Itagaki announced that he would be leaving Tecmo and Team Ninja on July 1, 2008, citing difficulties with the company. Although he was later judged innocent by a Tokyo district court, the lawsuit permanently strained the relationship between the Itagaki and Tecmo. In 2007 due to a lawsuit regarding alleged sexual harassment, his manager roles woud be revoked. Itagaki was promoted to Tecmo Executive Officer in June 2004, as well as to General Manager in 2006, alongside his position as the head of Team Ninja. Ninja Gaiden would release in 2004 to rave critical acclaim. However, due to the Itagaki being impressed with the technology capabilities of the new Xbox from Microsoft, development was moved to the plattform. Due to Sega exiting the console businesss, development was moved to the PlayStation 2. In 1999, Team Ninja started work on a new Ninja Gaiden project, originally intended for arcades, later for the Dreamcast. Team Ninja was formed by Tomonobu Itagaki from a group of game designers working at Tecmo specifically for the purpose of creating the home versions of the fighting game series Dead or Alive.

It is founded and formerly led by Tomonobu Itagaki, later by Yosuke Hayashi, and is best known for the Ninja Gaiden action-adventure game series and the Dead or Alive fighting game series. Team Ninja ( Japanese: チームニンジャ) is a Japanese video game developer, and a division of Koei Tecmo, founded in 1995 as a part of Tecmo.

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