Fuuto Tantei

is a Japanese mystery manga series written by Riku Sanjo and illustrated by Masaki Sato, as the official sequel to the original Kamen Rider W tokusatsu series, which originally aired in 2009 as part of Toei Company's Kamen Rider franchise. It has been serialized in Shogakukan's Big Comic Spirits since August 2017.

An anime television series adaptation by Studio Kai and Ishimori Entertainment aired from August to October 2022.

Plot
Taking place after Kamen Rider W Returns: Kamen Rider Accel, two years after the main TV series' finale, the story is centered on Shotaro Hidari, a private eye who works at Narumi Detective Agency, and his partner Raito "Philip" Sonozaki, the sole survivor of the Sonozaki family who can access the Gaia Library. Together they transform into Kamen Rider W, who protects the city of Fuuto from Dopants, monsters created by Gaia Memories. They solve cases alongside their boss Akiko Terui, who often joins their investigations with her husband Ryu Terui (a police superintendent who is also Kamen Rider Accel).

They continue to cleanup some of the Gaia Memory remnant, until one day, Shotaro encounters an amnesiac pink-haired girl named Tokime, who is being targeted by Dopants. After saving her, they decided to hire her at Narumi Detective Agency as their assistant. As the detective duo solve more Dopant cases, they gradually uncover Tokime's connection with the mysterious Aurora Dopant and her past life, along with the true potential of Gaia Memories' next stage used by Dopants in their human forms, dubbed High Dopes.