Originally, all 100 of the game's endings were going to be directed by co-director Kotaro Uchikoshi, with the writing being split up across the various in-house writers of Too Kyo Games. However, as the game received more content and deadlines approached, fellow co-director Kazutaka Kodaka became involved in various routes of the game. One of these routes was the "Cult of Takumi" route, which Kodaka began working on after learning that nobody else was working on a "damn sexy" route. The original plan for this route was for it to be a "sexy harem narrative", but as he wrote more, the story as seen in the final game became darker and more twisted.

During development, Too Kyo Games' initial deal with a publisher fell through, forcing them to make significant changes to the game such that they needed to take out a loan in order to continue development. However, because the studio couldn't amass the required capital via the sale of shares, they plunged into debt. Aniplex would later take on the publishing for the game. Three months after the game's release, co-director Kazutaka Kodaka revealed that it sold well enough that bankruptcy was no longer a serious concern for the studio.