Taking place two years after the Kamen Rider W 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 as research for Shotaro's work. Together they transform into the superhero Kamen Rider W, who protects the city of Fuuto from Dopants, monsters created by items called Gaia Memories.
Written by Riku Sanjo and illustrated by Masaki Sato, Fuuto PI started in Shogakukan's seinen manga magazine Big Comic Spirits on August 7, 2017.[1] In January 2024, it was announced that the manga had entered its "last stage" and took a break in February before starting a new story arc in April.[2][3] It took another hiatus in February 2025.[4] Shogakukan has collected its chapters into individual tankōbon volumes. The first volume was released on March 30, 2018.[5] As of March 28, 2025, eighteen volumes have been released.[6]
"Be Wary of the t (1)/The Man Who Fell in Love With a Witch" (tに気をつけろ 1/魔女に恋した男, Tī ni Ki o Tsukero Ichi/Majo ni Koi Shita Otoko)
"Be Wary of the t (2)/His Partner Is the Devil" (tに気をつけろ 2/相棒は魔少年, Tī ni Ki o Tsukero Ni/Aibō wa Ma Shōnen)
"Be Wary of the t (3)/The City's Trump Card" (tに気をつけろ 3/街の切り札, Tī ni Ki o Tsukero San/Machi no Kirifuda)
"Be Wary of the t (4)/The Half-Boiled's Pride" (tに気をつけろ 4/半熟の意地, Tī ni Ki o Tsukero Yon/Hanjuku no Iji)
"Be Wary of the t (5)/The Criminal Is There" (tに気をつけろ 5/犯人はそこにいる, Tī ni Ki o Tsukero Go/Yatsu wa Soko ni Iru)
"Be Wary of the t (6)/The Masked Guardian" (tに気をつけろ 6/仮面の守護神, Tī ni Ki o Tsukero Roku/Kamen no Shugoshin)
"Be Wary of the t (7)/Resolving the Request" (tに気をつけろ 7/依頼の決着, Tī ni Ki o Tsukero Nana/Irai no Ketchaku)
"Be Wary of the t (+α)/The Witch Who Settled in" (tに気をつけろ +α/住み着いた魔女, Tī ni Ki o Tsukero Purasu Arufa/Sumitsuita Majo)
Detective Shotaro Hidari continues protecting the town of Fuuto and receives a request from a citizen named Tsubokazi Chuuta who is searching for a "witch" named Tokime who took his bag. When finding her, Tokime easily escapes as she somehow changes the location the detective causing him to meet police officers who inform him of recent murders and realizes that he was instead sent to another city thanks to her. As an unknown threat comes, Shotaro's partner assists Shotaro in exploring how Tokime is able to transport to other areas using items known as Gaia Memories and is related to Fuuto's murders. After meeting Tokime again, Shotaro deduces that the witch is not a threat but instead an amnesiac woman lost between the two Fuuto Cities. Shotaro learns the murderer is related with the yakuza who transforms into a machine with Gaia Memories forcing Philip to fuse with Shotaro to become the hero Kamen Rider Double. Following the yakuza's arrest after combat, Shotaro has Chuuta who has been using the Gaia Memory and is arrested by their policeman Ryu. After Tokime tries redeem for her crimes, she decides to become Shotaro's partner, having become attached to him.
"The Worst m (1)/Valkyrie's Bodyguard" (最悪のm 1/戦姫のボディーガード, Saiaku no Emu Ichi/Senki no Bodīgādo)
"The Worst m (2)/The Buzz Which Calls Death" (最悪のm 2/死を呼ぶ羽音, Saiaku no Emu Ni/Shi o Yobu Haoto)
"The Worst m (3)/The Threat Descended" (最悪のm 3/降ってきた脅威, Saiaku no Emu San/Futtekita Kyōi)
"The Worst m (4)/Informant" (最悪のm 4/密告者, Saiaku no Emu Yon/Mikkokusha)
"The Worst m (5)/Philip's Conclusion" (最悪のm 5/フィリップの結論, Saiaku no Emu Go/Firippu no Ketsuron)
"The Worst m (6)/White Fangs" (最悪のm 6/白い牙, Saiaku no Emu Roku/Shiroi Kiba)
"The Worst m (7)/Game Over" (最悪のm 7/ゲームオーバー, Saiaku no Emu Nana/Gēmu Ōbā)
"Where Is the c? (1)/The Cat-Finding Expert" (cは何処に 1/猫探しの天才, Shī wa Izuko ni Ichi/Neko Sagashi no Tensai)
"Where Is the c? (2)/Call of the Beast" (cは何処に 2/獣の呼ぶ声, Shī wa Izuko ni Ni/Kemono no Yobu Koe)
"Where Is the c? (3)/Where Chao Belongs" (cは何処に 3/チャオの居場所, Shī wa Izuko ni San/Chao no Ibasho)
Narumi Detective Agency is hired by games company Max Soft to bodyguard Monako Moriguchi, the main programmer for the game Monster El Dorado who, unknown to the public, is also the game's idol Megu Kazamatsuri, after Megu receives death threats from someone known as "m". A Meganeura Dopant, who seeks vengeance against Megu. Although Kamen Rider W steps in to fight against it, a wounded Shotaro entrusts Tokime and the others to continue protecting Monako. Meanwhile, a man named Yukiji Bando appears before Murder, inviting him to a city of some kind before they are forced to flee his apartment following a tip-off about Ryu's raid. Tokime and Majima discover that one of Monako's makeup artists, Midori Koizumi, is the informant leaking information to Murder, learning that she had just told him about Megu's true identity. Using a power-up drug he received from Bando, Murder launches an attack on Monako. Tokime rushes in to stop Murder from escaping with Monako before Philip catches up to them as defeats Murder. Following the incident, Monako's manager Majima, who had been fighting against management for their poor treatment of Monako, leaves the company to form his own game studio, with Monako deciding to go along with him. The last chapters involve the Agency finding a missing cat and discovering its connection with Dopant.
"The Closed k (1)/The Dynamic Duo's Disaster" (閉ざされたk 1/名コンビ遭難, Tozasareta Kē Ichi/Mei Konbi Sōnan)
"The Closed k (2)/Masked Nights" (閉ざされたk 2/仮面の夜を重ねて, Tozasareta Kē Ni/Kamen no Yoru o Kasanete)
"The Closed k (3)/Drunken Devil" (閉ざされたk 3/泥酔した悪魔, Tozasareta Kē San/Deisui Shita Akuma)
"The Closed k (4)/Serial Murder" (閉ざされたk 4/連続殺人, Tozasareta Kē Yon/Renzoku Satsujin)
"The Closed k (5)/Chain of Malice" (閉ざされたk 5/連鎖する悪意, Tozasareta Kē Go/Rensa Suru Akui)
"The Closed k (6)/Crimson Reinforcements" (閉ざされたk 6/真紅の援軍, Tozasareta Kē Roku/Shinku no Engun)
"The Closed k (7)/Frightening Truth" (閉ざされたk 7/おそるべき真実, Tozasareta Kē Nana/Osorubeki Shinjitsu)
"The Closed k (8)/Ultimate Two in One" (閉ざされたk 8/究極は二人で一人, Tozasareta Kē Hachi/Kyūkyoku wa Futari de Hitori)
"The Closed k (9)/Until the Day We Make a Toast" (閉ざされたk 9/いつの日か君と乾杯を, Tozasareta Kē Kyū/Itsu no Hi ka Kimi to Kanpai o)
Shotaro and Philip get lost in a blizzard and are rescued by a woman, Kanna Kubokura, who brings them to a mansion. Its owner, Kuya Kagamino, has four potential brides, Kanna included, must try to appeal to him without letting their identities be found out. Shotaro discovers one of the candidates, Koyomi Zaizen, impaled on a tree before he and Philip encounter a Dopant. Kei becomes the next victim after Kurumi discovers her dead in the bath. Kurumi, revealed to be in possession of the Alcohol Memory, attempts to stop Kanna from leaving the mansion, only for it to actually be Philip in disguise. He claims candidates were unknowingly installed with slots for the Alcohol Memory; Kanna used it first, but blacked out and lost her memory, then Koyomi used it to try and kill Kei, but died from alcohol poisoning, after which Kei impaled her body onto the tree and then tried to attack Kurumi, only to also die from poisoning. They are confronted by another Dopant. The true mastermind and owner of the Alcohol Memory is revealed to be Kuya's grandmother, Kiku, who had ties with Museum, the evil organization behind the Gaia Memories, and sought to find a suitable wife for Kuya who could inherit the Alcohol Memory. Kiku transforms into the true powerful Alcohol Dopant, prompting Shotaro and Philip to destroy it without injuring Kiku, but this in turn causes the mansion to self-destruct, taking Kiku and her butler Kimura along with it. Shotaro and Philip are formally confronted by Bando, who reveals himself as the Aurora Dopant before disappearing.
"The Grim Reaper With the Face of the l (1)/An Active Woman" (死神はlの顔 1/行動力の女, Shinigami wa Eru no Kao Ichi/Kōdōryoku no On'na)
"The Grim Reaper With the Face of the l (2)/Why Does the Dead Person Have a Smile?" (死神はlの顔 2/死者は何故笑う, Shinigami wa Eru no Kao Ni/Shisha wa Naze Warau)
"The Grim Reaper With the Face of the l (3)/A Weird Demon" (死神はlの顔 3/奇怪なる魔人, Shinigami wa Eru no Kao San/Kikai Naru Majin)
"The Grim Reaper With the Face of the l (4)/Great Magic" (死神はlの顔 4/大魔術, Shinigami wa Eru no Kao Yon/Daimajutsu)
"The Grim Reaper With the Face of the l (5)/Stop the Tragedy" (死神はlの顔 5/惨劇を止めろ, Shinigami wa Eru no Kao Go/Sangeki o Tomero)
"The Grim Reaper With the Face of the l (6)/The Night in Round Barrel Island" (死神はlの顔 6/ロンドバレル島の夜, Shinigami wa Eru no Kao Roku/Rondo Bareru-tō no Yoru)
"The Grim Reaper With the Face of the l (7)/The Identity of the Memory" (死神はlの顔 7/メモリの正体, Shinigami wa Eru no Kao Nana/Memori no Shōtai)
"The Grim Reaper With the Face of the l (8)/The Curse of the Terror" (死神はlの顔 8/恐怖の呪縛, Shinigami wa Eru no Kao Hachi/Terā no Jubaku)
"The Grim Reaper With the Face of the l (9)/Don't Forget to Smile" (死神はlの顔 9/笑顔を忘れない, Shinigami wa Eru no Kao Kyū/Egao o Wasurenai)