This article is about a/an monster in Kamen Rider Zero-One.

Tatsumi Arayashiki (新屋敷達己 Arayashiki Tatsumi) is a realtor who is hired by ZAIA Enterprise Japan to compete against Smile Sumida but is given a Raidriser and Progrisekey by Naki to transform into the Splashing Whale Raider (スプラッシングホエールレイダー Supurasshingu Hoēru Reidā).


Tatsumi belonged to family with low earnings. He and his family used to live in a small house with almost no necessities or luxuries. Because of such a life, Tatsumi started dreaming of living in a large house, and ended up becoming a real-estate agent.

In the present, Tatsumi is chosen by Gai as the representative for real-estate stage competition against the Humagear Smile. Tatsumi boastfully to Gai that he will succeed. Despite his success during the competition, Gai disappointed by his rating sale for almost being competed which giving a great pressure to Tatsumi, unaware that Gai actually wanted to make him going on malicious act. During the depression, Tatsumi was given a Raidriser alongside the Splashing Whale Progrisekey by Naki while he was on the way back to his office.

Being taken by the pressure, Tatsumi used the Raidriser and caused a havoc on a home which is introduced by Smile. Aruto fights, but only going on without a proper fight which letting Tatsumi to succeed on breaking the house. This resulted his selling rate goes higher than before. Gai suspects Tatsumi to cheat, but Tatsumi seems to cover his lie. Despite that, Tatsumi aware that Gai has suspected him and goes to throw a tantrum towards Smile on the next day. Tatsumi is shocked that his act makes Smile get hacked and turn into a Magia and runs away in fear.

This experience soon giving a lesson to Tatsumi as when a millionaire asks for a new home and Smile has discovered one, Tatsumi provokes Oyakata, the carpenter to turn into a Magia and gives the Magia a one side battle as Tatsumi becomes the Whale Raider. Isamu is on the site and going to beat them all using Vulcan Punching Kong, but fails and Gai arrives to jack Isamu's Punching Kong power, destroying Oyakata and somehow turning the side of Tatsumi's cheating.

Unfortunately for Tatsumi, Aruto creates five more Oyakata and manages to build the same home on a different site, giving the winning towards Smile as Tatsumi doesn't think the rich man truly needs. This angers him to the point of destroying Smile. But Aruto becomes Zero-One Shining Assault Hopper to defeat Tatsumi, this time for real. Tatsumi cries on the pressure that he is put and actually wants to admit Smile's achievement. But since he has been defeated even as a Raider, he finally lets go of his depression completely and asks for forgiveness, giving the winning praise to Smile. But as Tatsumi predicted, ZAIA actually won by the profit achievement.


Tatsumi is a very boastful man and arrogant with his skills on luring people to buy the real-estate from him. Despite his boastful, his result is indeed showing the promise which even Smile unable to surpass without Tatsumi going on cheating. The trauma he has since a kid become a moral support for him to help people to have a huge house and having fun.

Unfortunately, Gai knows his weak point and pressuring him and it makes Tatsumi to lose confidence, even the value of with family, going only to lure people to buy a big house instead. After Aruto was able to convince him, Tatsumi shows his guilt from his cheating path and admitted his loss fairly.


Splashing Whale Raider
KR01-Splashing Whale Raider

Splashing Whale Raider

"Raidrise! Splashing Whale! An aqua current that encompasses everything around it."
―Transformation announcement via Raidriser[src]


  • Height: 197.0 cm
  • Weight: 127.9 kg

Tatsumi transforms into Splashing Whale Raider (スプラッシングホエールレイダー Supurasshingu Hoēru Reidā) by using the Splashing Whale Progrisekey in the Raidriser.


  • Ougigant (オウギガント Ougiganto): The fan-style polearm based on a whale's tail.


  • Cyclones: The Splashing Whale Raider can generate blue cyclones by swinging the Ougigant towards his targets. The cyclones are strong enough to damage a building.
  • Water Bullets: The Splashing Whale Raider can shoot water bullets from the Ougigant's tip, located between the "Tail Fins".
  • Strength: The Splashing Whale Raider possess enough strength to lift the Mammoth Magia off its feet.
  • Energy Slash: The Splashing Whale Raider can generate a giant energy construct resembling the Ougigant's tip, which he can slam down to create shockwaves.


  • Splashing Bolide (スプラッシングボライド Supurasshingu Boraido): The Splashing Whale Raider generates a giant blue projection of the Ougigant made of Water, before slamming it down.

Appearances: Zero-One Episode 19-20


Behind the Scenes


Tatsumi Arayashiki is portrayed by Minato Isshiki (一色 湊 Isshiki Minato).



  • Arayashiki's open-mouthed smile is analogous to Smile Sumida's trademark smile.
  • The Splashing Whale Raider is the first whale monster since the Whale Imagin.
    • The Splashing Whale Raider and the Whale Imagin wield similar weapons, with both being polearms with a forked tip resembling the tail fin of a Whale.
  • Tatsumi Arayashiki is the first representative to have won through cheating. This is later got followed by the last representative.



Icon-zero-one Kamen Rider Zero-One
Kamen Riders
Aruto Hiden - Isamu Fuwa - Yua Yaiba - Jin - Horobi - Raiden - Gai Amatsu
Movie-exclusive: Soreo Hiden
Hiden Zero-One Driver - A.I.M.S. Shotriser - MetsubouJinrai Forceriser - Zetsumeriser - Zaia Thousandriver - Cycloneriser - Raidriser - Zaia Slashriser - Progrisekeys - Progrise Holder - Progrisekey Connector - Hiden Risephone - Attache Calibur - Attache Shotgun - Attache Arrow - Breaking Mammoth - Giger - Authorise Buster - Assault Grip - Thousand Jacker - Progrise Hopper Blade
Hiden Intelligence: Korenosuke Hiden - Soreo Hiden - Jun Fukuzoe - Sanzo Yamashita
HumaGears: Izu - Shester - Soreo Hiden - Wazu Nazotoku - Subaru - Bot Hakase - Fukkinhoukai Jiro
A.I.M.S.: Isamu Fuwa
Zaia Enterprise: Gai Amatsu - Yua Yaiba
Legend Riders: Sougo Tokiwa - Geiz Myokoin - Woz - Tsukuyomi
Humans: Norio Uozumi - Go Sakurai - Satoshi Sakurai - Choichiro Ishizumi - Seiji Tazawa - Satō - Yuta Yomura - Isao - Shinya Owada
HumaGears: MaGe Ana - Nigiro Ikkan - Anna - Mashirochan - Dr. Omigoto - Z #5
A.I.s: Zea - Zat
Ark - Horobi - Naki - Jin - Raiden - Little Assassin
Footsoldiers: Trilobite Magia - Dodo Magia Chick
Monsters: Berotha Magia - Kuehne Magia - Ekal Magia - Neohi Magia - Onycho Magia - Vicarya Magia - Gaeru Magia - Mammoth Magia - Dodo Magia - Arsino Magia
Other Villains:
Finis - Will
Monsters: Crushing Buffalo Raider - Splashing Whale Raider - Dynamaiting Lion Raider - Storming Penguin Raider - Scouting Panda Raider - Fighting Jackal Raider
Footsoldiers: Battle Raiders
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