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After all these happened, is there even an end in counting them!?
~ Katsumi Daido's response to Kamen Rider W's pre-battle catchphrase ("Now, count your sins!"); as well as his most famous quote.
Now, enjoy your hell!
~ Katsumi's post-battle catchphrase

Katsumi Daido is the leader of the NEVER terrorist group and the main antagonist of Kamen Rider W Forever: A to Z/The Gaia Memories of Fate as well as the main protagonist of Kamen Rider W Returns: Kamen Rider Eternal.

An alternate version of him later returns as an antagonist in episodes 45 and 46 of Kamen Rider Zi-O.

He was portrayed by Mitsuru Matsuoka, who later played Kamen Rider 4 in D-Video Special: Kamen Rider 4.


Kamen Rider W Returns: Kamen Rider Eternal

Katsumi Daido's mother was Miki Daido, a researcher for Foundation X studying Necro-Overs to duplicate the conditions that revived Raito Sonozaki / Philip. After Katsumi fell victim to a fatal car crash, Miki used her research to save her son by converting him into a Necro-Over.

However, the Foundation rejected Miki's research in favor of the Museum's research into Necro-Overs, causing Katsumi and his mother to leave the Foundation. The two later revived four other people who had recently died into Necro-Overs and together they founded the mercenary group NEVER.

During a mission to South Asia where NEVER wa fighting a terrorist organization, Katsumi encountered a Quark named Mina and fell in love with her. Katsumi later met with Jun Kazu and obtained the experimental Eternal Memory, allowing him to become Kamen Rider Eternal.

However, after Doctor Prospect killed all of the Quarks, including seemingly Mina, Katsumi went insane before killing Prospect with Memory's Maximum Drive. His Eternal Memory damaged, Katsumi discarded it and decided to wipe out the Museum.

Kamen Rider W Forever: A to Z/The Gaia Memories of Fate

Katsumi attacked the helicopter Tabata was riding to transport the briefcase of T2 Gaia Memories to Foundation X's base. Katsumi took the T2 Eternal Memory and transforming into Eternal before stealing the entire case and goes to his accomplices. However, Tabata activates a switch to cause the briefcase and helicopter to explode, causing the Memories to rain down across Futo City. Katsumi escapes the explosion and goes with his men search for the remaining Memories.

Katsumi later appears at the place the Riders came to meet Maria S. Cranberry and attacks Kamen Rider Double, overpowering him in both his FangJoker and CycloneJokerXtreme forms. After defeating Double, defeated, Katsumi takes the 19 T2 Gaia Memories the Riders found. After capturing Phillip and obtaining all 26 of the T2 Gaia Memories, Daido initiates the X-Bicker to send out a wave to turn everyone into Necro-Overs, despite knowing that they will die due to not being as enhanced as he is. However, Philip and Shotaro reactivate their Gaia Memories and mount a counterattack against Daido. As this happens, Maria betrays Katsumi and injects with a serum to cause him to start dissolving. However, Katsumi shoots Maria and takes another serum to stabilize himself before escaping and leaving her for dead.

The Riders soon catch up to Katsumi, but he quickly escapes again. Double then catches up again to Eternal on the Futo Tower and fights Eternal. As Double CycloneJokerXtreme is about to finish off, Eternal goes into his Strengthening Armament mode and uses the Zone Memory to summon the other T2 Gaia Memories. He then uses the Never Ending Hell Maximum Drive to knock Double off the Futo Tower and send him plummeting to his death, but through the support of the citizens of Futo and a strong gust of wind blowing into the Xtreme Memory, Double changes from CycloneJokerXtreme to CycloneJokerGoldXtreme. Eternal casts a blast of energy at Double, but Double counters the attack and delivers a kick to Eternal powerful enough to defeat him and 26 T2 Gaia Memories at once. With his very last breath, Katsumi expresses that he remembers what death feels like before dying. 


Katsumi's backstory was later told to Shotaro and Philip by Mina. After hearing it, the two lamented how Katsumi could have become a heroic Kamen Rider and protected Futo City had his encounter with Prospect not driven him insane.

Kamen Rider Zi-O

An alternate version Katsumi Daido from Another World appeared as an antagonist in Episode 45 & 46 of Kamen Rider Zi-O. According to Tsukasa Kadoya, this A.R. World version of Katsumi defeated Kamen Rider W in an altered variation of the events during Kamen Rider W Forever: A to Z/The Gaia Memories of Fate. He was later brought to the main universe by Sworz to fight Sougo Tokiwa after the former became Another Decade.

However, Eternal was later transported to the Another World by Sougo, causing his finisher to destroy it. With his Another World destroyed, Eternal began to fade away. De-transforming, Katsumi thanked Sougo for helping him to reunite with his comrades again before disappearing.

Kamen Rider: Beyond Generations

Kamen Rider Eternal was resurrected as a demon as part of the Devil Rider Corps. He acted as an enforcer for the demons who controlled the future in 2071. When the future George Karizaki sent Ryunosuke Momose back in time with the Cyclotron Driver, the Devil Rider Corps were sent to attack George's laboratory, but were fought off by Touma Kamiyama, Rintaro Shindo, Yuri, Vice, Daiji Igarashi and Sakura Igarashi using the Clone Rider system.



  • Katsumi's actor, Mitsuru Matsuoka, is also a singer who is well known for singing several songs for Kamen Rider series, including SURPRISE-DRIVE, the main theme song of Kamen Rider Drive.


           W Title.pngVillains

Museum/Sonozaki Family
Ryubee Sonozaki | Saeko Sonozaki | Wakana Sonozaki | Kirihiko Sudo | Mick | Shinkuro Isaka | Masquerade Dopants

Foundation X
Neon Ulsland | Jun Kazu | Tabata | Doctor Prospect | Lloyd | Shion

Katsumi Daido | Jun Kazu | Maria S. Cranberry | Kyosui Izumi | Reika Hanehara | Ken Ashihara | Gozo Domoto

Shiro Endo | Energy

Magma Dopant | T-Rex Dopant | Money Dopant | Anomalocaris Dopant | Cockroach Dopant | Sweets Dopant | Virus Dopant | Violence Dopant | Masquerade Dopants | Arms Dopant | Bird Dopant | Ice Age Dopant | Triceratops Dopant | Liar Dopant | Dummy Dopant | Puppeteer Dopant | Invisible Dopant | Nightmare Dopant | Beast Dopant | Zone Dopant | Yesterday Dopant | Quetzalcoatlus Dopant | Hopper Dopant | Gene Dopant | Jewel Dopant | Old Dopant | Energy Dopant | Oyakodon Dopant | Bat Dopant | Spider Dopant | Commander Dopant | Death Dopant

           Zi-O Logo.png Villains

Time Jackers
Swartz | Uhr | Ora | Tid | Finis

Another Riders
Another Build | Another Ex-Aid | Another Fourze | Another Faiz | Another Wizard | Another OOO | Another Double | Another Den-O | Another Kuuga | Another Gaim | Another Ghost | Another Shinobi | Another Quiz | Another Ryuga | Another Kikai | Another Zi-O | Another Blade | Another Agito | Another Ryuki | Another Hibiki | Another Kiva | Another Kabuto | Another Den-O II | Another Drive | Another Decade | Another Zero-One | Another 1 | Another Diend

Oma Zi-O's Army
Oma Zi-O | Woz | Kasshin | Dai Mazines

Future Riders
White Woz | Kamen Rider Ginga

Legendary Riders
Masato Kusaka | Kaito Kumon | Tsukasa Kadoya | Hajime Aikawa | Daiki Kaito | Shun Kageyama | Katsumi Daido

Another World Riders
Kamen Rider G4 | Kamen Rider Fuma | Kamen Rider Dark Ghost | Kamen Rider Rey | Kamen Rider Eternal | Kamen Rider Woz | Kamen Rider Yuuki

Kamen Rider Barlckxs | Kagen | Jogen | Woz | Kasshin | Dai Mazines

Tid's Army
Masquerade Dopants | Waste Yummies | Stardust Ninja Dustards | Elementary Inves | Ghouls | Lost Number Roidmudes | Gamma Commandos | Guardians | Hard Guardians

Swartz's Army
Monsters: Strong Smash Hazard | Mashin Chaser | Elementary Inves | Orion Zodiarts | Shika Inves | Utopia Dopant | N-Daguva-Zeba | Sagittarius Zodiarts | Gamedeus | Kamen Rider Evol
Footsoldiers: Guardians | Masquerade Dopants | Elementary Inves | Lost Number Roidmudes | Ghouls | Gamma Commandos | Bugster Virus

Salis Worms | Gryllus Worm | Imposter Shun Kageyama

Waste Yummies | Gamma Commandos | Humanoise | Mole Imagin | Narutaki

Rider Time Shinobi
Niji no Hebi
Yaminin | Stardust Ninja Dustards

Rider Time Ryuki
Tatsuya Kano | Takeshi Asakura | Jun Shibaura | Dark Shinji | Ishihashi | Tozuka | Kamen Rider Odin

           KRRe-Revice Show Logo.webp Villains

Giff | Aguilera | Olteca | Julio | Chameleon Deadman | Kanae Motomura | Chigusa Yamagiri
Deadmen: Mammoth Deadman | Rex Deadman | Kamakiri Deadman | Megalodon Deadman | Kong Deadman | Spider Deadman | Lion Deadman | Kangaroo Deadman | Cheetah Deadman | Brachio Deadman | Planarian Deadman | Kurage Deadman | Insect Deadman | Crayfish Deadman | Sabertiger Deadman | Koala Deadman | Orangutan Deadman | Shark Deadman | Elephant Deadman | Rafflesia Deadman
Contract Holders: Ibata | Araki | Ayaka Oketani | Masao Honda | Amahiko Haitani | Seiko Omori | Mayu Tominaga
Footsoldiers: Giff Junior | Gifftarian | Hell Gifftarian
Giff Demons: Vail | Vice | Kagero
Others: Namio Yoshida | Judge | Hitoshi Maezono | Sword Roidmude | Heat Dopant | Shika Inves

Hideo Akaishi | George Karizaki | Akemi Mikoshiba

Agariyama | Masumi Karizaki | Shozo Irabu

Diablo | Himiko Crisper | Khufu Crisper | Edison Crisper | Leonidas Crisper
Devil Rider Corps: Shocker Rider 1 | Shocker Rider 2 | Kamen Rider Ouja | Kamen Rider Eternal | Kamen Rider Sorcerer | Kamen Rider Duke | Kamen Rider 4 | Kamen Rider Barlckxs

Zanjioh | Poison Lizard Man | Saboteguron | Shiomaneking | Scorpion Man | Ghoster | Jaguarman | Shocker Combatmen