樋口真嗣
The concept for "Biohazard 4D-Executer" was originally conceived by anime director Yasuhiro Imagawa, who proposed his idea of the film to Capcom, the game company responsible for the "Resident Evil" series. The project was announced to the public in late October 1999, under the tentative title "Biohazard 4D-Horror". In the early stages of development, Imagawa was responsible for the planning and the screenplay, and he collaborated on the film with director of photography Shinji Higuchi. The final script was written by Daisuke Okamoto, under the supervision of Capcom's screenwriting subsidiary Flagship. Former Capcom Production Studio 2 game designer and producer Keiji Inafune and Flagship co-founder Noboru Sugimura served as executive supervisors. Inafune referred to the story as a "gaiden" – or side-story – for fans of the "Resident Evil" series.