細江慎治
Development of the game began after Uchikoshi joined Chunsoft to write a visual novel for them that could reach a wider audience; Uchikoshi suggested adding puzzle elements that are integrated with the game's story. The inspiration for the story was the question of where inspiration comes from; while researching it, Uchikoshi came across Rupert Sheldrake's morphic resonance hypothesis, which became the main focus of the game's science fiction elements. The music was composed by Shinji Hosoe, while the characters were designed by Kinu Nishimura. The localization was handled by Aksys Games; they worked by the philosophy of keeping true to the spirit of the original Japanese version, aiming for natural-sounding English rather than following the original's exact wording.