

Filming began in mid-June 2019, and the cast were introduced through a scheduled press conference in July. įrom this time until May, head writer Yuya Takahashi had completed the scripts for the first two episodes, while auditions for the cast were held.

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With the show being heavily-themed in technology, the name "Zero-One" was chosen as a reference to binary code and the trademark was filed on April 19, 2019. Omori came up with the idea of "Rei-One", which was a shortening of "Reiwa's first Rider." It was later pointed out that "rei" could also be read as "zero", and that there was already a superhero named Kikaider with the "01" moniker. The suit's design was completed in time before the Reiwa-era change, but a name had not been decided on yet.

Producer Takahito Omori had visited several technological institutes and spoke with many professors and experts on the topic of artificial intelligence.
