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Icon-fourzeThis article is about an organization in Kamen Rider Fourze.
OSTO Logo

OSTO Logo

The Over Space Technology Organization (外宇宙技術開発機構, Gai Uchū Gijutsu Kaihatsu Kikō) or OSTO (オスト, Osuto) for short, is a science organization that created a lot of cutting-edge (if unusual) technology through Cosmic Energy. One of their most usually seen products are the Astro and Zodiarts Switches, and the equipment of Kamen Rider Fourze.

A space station owned by OSTO was on the moon until it was destroyed in an explosion with the Zodiarts Switches stolen by a man with glowing red eyes, with the Rabbit Hatch being all that remained of the original station. That man would later become the maker of Kamen Rider Meteor's equipment.

After the disaster, OSTO was supposedly remade into OSTO Legacy, and later make themselves known to the Kamen Rider Club's Kengo Utahoshi, inheritor of the Rabbit Hutch, when the Arissia Union began their attack on humanity. However, it turned out that OSTO had dissolved after the space station's destruction, with OSTO Legacy being a front to the true villains of this incident.

Eventually, all hints of OSTO's greatness were wiped away with the deaths of Kuniteru Emoto and Mitsuaki Gamou, as well as the destruction of the Rabbit Hatch, with only a now human Core Child Kengo Utahoshi being what's left of OSTO's legacy.

Icon-fourze Kamen Rider Fourze
Kamen Riders
Main Riders: Gentaro Kisaragi - Ryusei Sakuta
Movie/Novel-exclusive: Nadeshiko Misaki - Tsubasa
Stageshow-exclusive: Kaizo Jingu - Tomoko Nozama - Shun Daimonji - Miu Kazashiro
Debatable Riders: Kouhei Hayami - Rider Hunter Boot
Gear
Transformation Devices
Fourze Driver - Meteor Driver- Nadeshiko Driver
Astroswitch-related
Astroswitches - Astroswitch Case - NS-MagPhone
Astroswitch-related Weapons
Fourze Modules - Billy the Rod - Hee-Hackgun - Barizun Sword - Meteor Galaxy - Meteor Storm Shaft
Vehicles
Machine Massigler - Machine Meteorstar - Powerdizer
Allies
Kamen Rider Club: Yuki Jojima - Kengo Utahoshi - Miu Kazashiro - Shun Daimonji - Tomoko Nozama - JK - Chuta Ohsugi - Ran Kuroki - Haru Kusao - Saburo Kazeta - Rumi Komaki - Daita Kondou - Chikao Nezu - Miyoko Ohki
Ishinomori Characters: Inazuman - XVII - Skydain - Groundain - Black Knight - Inga Blink
Legend Riders: Momotaros - Urataros - Kintaros - Ryutaros - Tsukasa Kadoya - Daiki Kaito - Philip - Shotaro Hidari - Ryu Terui - Eiji Hino - Akira Date - Shintaro Goto - Haruto Soma- Kouta Kazuraba - Takeru Tenkuji - Emu Hojo - Sento Kiryu - Ryuga Banjo - Sougo Tokiwa - Geiz Myokoin
Others: Naomi - Owner - Ankh - Hina Izumi - Tsukuyomi
Zodiarts
The Horoscopes: Sagittarius - Virgo - Leo - Libra - Scorpio - Cancer - Aries - Capricorn - Aquarius - Taurus - Gemini - Pisces
Zodiarts: Orion - Chameleon - Unicorn - Hound - Altar - Pyxis - Perseus - Lynx - Dragon - Pegasus - Cygnus - Coma - Musca - Hercules - Lepus
Others: Stardust Ninja Dustards
Foundation X
Lem Kannagi - Katal - Solaris - Controller Kiima - Suddendath Beta
Akumaizer
Xatan - Eel - Gahra
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