Hard-boiled private investigator Shoutarou Hidari works for the Narumi Detective Agency and lives in Fuuto with his curious partner, Philip, to keep the peace. Tokime, a mystery lady Shoutarou meets one night, is quickly implicated in a string of thefts and murders.
In his search for the source of these Dopants, Shoutarou discovers that some individuals are employing "Gaia Memories," which are memory devices akin to thumb drives that store huge amounts of data, to transform into powerful creatures.
While the detective agency has successfully eliminated the vast majority of Gaia users in the past, a sizable minority remains and poses a significant threat to society.
To protect Fuuto from the evil Dopants, Gaia users Shoutarou and Philip must once again assume the persona of the legendary hero Kamen Rider W, all the while learning the truth about Tokime's true identity and facing the past that has been buried for so long.
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