Development for "Killer7" began in mid-2002 as part of the Capcom Five, a set of games overseen by Shinji Mikami and intended to be exclusive to the GameCube. Capcom produced the games to bring new intellectual property to the video game industry, which the company viewed as stagnant. "Killer7"s gameplay mechanics were finalized late in development because most resources went to story and visual work. Director Suda51 wrote the scenario based on a plot he conceived together with Mikami, and later decided on the unconventional control scheme as a deconstruction of how gamers play and to "create new expression". Complex controls and combos were omitted to present a system that fosters easy progression for the player. Producer Hiroyuki Kobayashi described the controls as "intuitive" and stated that the team wanted players to "think when they are playing" so they can enjoy the mystery in the story. The long development process culminated in several delays, the last of which was due to an artistic desire to release the game on July 7 (7/7).