It has been serialized in Shogakukan's seinen manga magazine Big Comic Spirits since August 2017, with its chapters collected in 17 tankōbon volumes as of October 2024.

Taking place after Kamen Rider W Returns: Kamen Rider Accel, two years after the main TV series' finale, Fuuto PI sees the return of Shotaro Hidari, a private detective 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.

They solve cases alongside their boss Akiko Terui, who often joins their investigations with her husband Ryu (a member of the police force who is also Kamen Rider Accel).

Fuuto PI, written by Riku Sanjo and illustrated by Masaki Sato, started in Shogakukan's seinen manga magazine Big Comic Spirits on August 7, 2017.

[25][26] The opening theme song is "Private Eye" by Big Gadgets ft. Aya Kamiki w TAKUYA while the ending theme song is "Tsumi to Batsu to Underground" (罪と罰とアングラ, "Crime, Punishment, and the Underground") by Mitsuru Matsuoka and Kōji Kikkawa, who previously portrayed Kamen Riders Eternal and Skull.

[31][32] The film takes place directly after the anime's final episode, and through flashbacks details the final moments of Sokichi Narumi/Kamen Rider Skull, leading up to the events of the first episode of Kamen Rider W. A stage play adaptation ran at the Sunshine Theatre in Tokyo from December 29, 2022, to January 15, 2023, and at the Umeda Arts Theater Dramacity in Osaka from January 19–25, 2023.