"Chrono Trigger" was conceived in 1992 by Hironobu Sakaguchi, producer and creator of the "Final Fantasy" series; Yuji Horii, writer, game designer and creator of the "Dragon Quest" series; and Akira Toriyama, character designer of "Dragon Quest" and creator of the "Dragon Ball" manga series. Traveling to the United States to research computer graphics, the three decided to create something that "no one had done before". After spending over a year considering the difficulties of developing a new game, they received a call from Kazuhiko Aoki, who offered to produce. The four met and spent four days brainstorming ideas for the game. Square convened 50–60 developers, including scenario writer Masato Kato, whom Square designated story planner. Development started in early 1993. An uncredited Square employee suggested that the team develop a time travel-themed game, which Kato initially opposed, fearing repetitive, dull gameplay. Kato and Horii then met several hours per day during the first year of development to write the game's plot. Square intended to license the work under the "Seiken Densetsu" franchise and gave it the working title "Maru Island"; Hiromichi Tanaka (the future producer of "Chrono Cross") monitored Toriyama's early designs. The team hoped to release it on Nintendo's planned Super Famicom Disk Drive; when Nintendo canceled the project, Square reoriented the game for release on a Super Famicom cartridge and rebranded it as "Chrono Trigger". Tanaka credited the ROM cartridge platform for enabling seamless transition to battles on the field map.