1) Summery: This film went through numerous project proposals and plot drafts before the story plan was finalized and the script was written. Many creators contributed ideas, engaging in extensive discussions and deliberations, and ultimately, Kazuki Omori wrote the script to complete the story. This book presents three versions of the script—the draft, the revised draft, and the final version—along with a selection of the plots and project proposals that were considered during the development process. 2) The screenplay for this film was written by Kazuki Omori, who also served as both screenwriter and director for the previous film, Godzilla vs King Ghidorah (1991). There were several twists and turns before it was decided that the main storyline would focus on the confrontation between Godzilla and Mothra, as indicated in the title. 3) The origins of the project can be traced back to the period between Terror of MechaGodzilla (1975) and Godzilla (1984), when Godzilla films were on hiatus. In an effort to revive the Godzilla franchise, producer Tomoyuki Tanaka conceived and developed the project “The Return of Godzilla.” Within this project, the legendary Chinese monster Bagan was considered as Godzilla’s adversary. However, the film that was ultimately produced, while having a story quite similar to “The Return of Godzilla,” did not feature Bagan, and instead presented Godzilla as a solitary monster in the 1984 film Godzilla. 4) Following the success of the 1984 Godzilla film, the next project planned was “Godzilla vs Biollante” (1989). However, since it didn’t meet the expected box office performance, producer Tanaka began considering a film featuring a monster other than Godzilla as the main character for the next project. The monster chosen was Mothra. Furthermore, the monster considered as the opponent was Bagan, who was originally planned to appear in “The Return of Godzilla.” A script (draft) titled “Mothra vs Bagan” was written by director Omori, and it was compiled into a bound volume in December 1990, a year after the release of Biollante. The design of Bagan was spearheaded by Koichi Kawakita, who was slated to be the special effects director, and multiple character image drawings were created, eventually leading to the completion of the final design by Minoru Yoshida. 5) However, from a commercial standpoint, it was decided that it would be better to use a popular monster from previous films as the opposing monster. In a survey conducted during the release of Biollante, King Ghidorah, who was the most popular among young boys, emerged as a potential antagonist, and a “Mothra vs. King Ghidorah” project was considered. On the other hand, there was strong demand from a business perspective for a Godzilla film as part of the series, and ultimately, Godzilla vs King Ghidorah (1991) was chosen as the next film. 6) Following the success of King Ghidorah, which featured a battle between Godzilla and another popular monster, Mothra was chosen as Godzilla’s next opponent. After Godzilla vs Mothra was officially decided, Omori began working on the story. Using his previously written “Mothra vs Bagan” story as a basis, he decided to introduce a new monster in addition to Godzilla and Mothra. The monster was initially named “Bagan” in the plot, but later changed to “Desla (tentative),” then to “Battra” in the draft script, and finally settled on “Battra,” a battle-form of Mothra. 7) Meanwhile, special effects director Kawakita independently pursued his own project development, compiling his creative ideas into a proposal and design plan for the next King Ghidorah film. The concept involved humans shrinking to microscopic size and entering Godzilla’s body, with a new monster, Gigamos, being conceived. The plan, titled “Micro Super Battle Godzilla vs Gigamos,” also included the appearance of Mecha-Kong. This project, which involved commissioning plots, proposals, and monster designs from numerous designers, assistant directors, writers, and illustrators, was compiled as “Godzilla vs Gigamos” and submitted to Toho. Furthermore, a plan for “Godzilla vs. Mecha-Kong” was also considered under the same concept. While these projects were recognized for their originality, they did not align with the series concept that Toho and Toho Pictures had built, resulting in them being evaluated only as reference projects. 8) Once the next film was officially decided to be “Godzilla vs Mothra,” and this was announced to the public in a teaser trailer released during the theatrical run of Godzilla vs King Ghidorah, special effects director Kawakita joined producer Tanaka and writer Omori on the project. The design for Battra was created by extensively modifying a design that had originally been considered for Gigamoth.