Atsushi Inaba originally worked for the company Irem, working on a game called R-Type Leo. From that point he joined Nazca, and then SNK, where he worked on Samurai Shodown. Inaba later joined Capcom in 1998, after reading an advertisement in a magazine, with high hopes of working on the next Resident Evil game. In the end however, he worked on Devil May Cry, which was also being worked on by Hideki Kamiya, and later made games within the Steel Battalion and Ace Attorney series, including Phoenix Wright: Ace Attorney: Justice for All, and Steel Battalion: Line of Contact.
Inaba, Hideki Kamiya, and Shinji Mikami later started working at Clover Studio, a subsidiary of Capcom known for games such as, God Hand, Viewtiful Joe and Ōkami, however, this company was later closed down by Capcom in 2007, with Capcom keeping the rights to the franchises. After this, Inaba set up SEEDS Inc., which was later merged with ODD Inc. to form PlatinumGames in 2007, which included many other ex-Clover Studio employees, from there Inaba worked as the Producer for PlatinumGames, and still works there to this day.