That One! Seiji Takaiwa: Terrifying Identity? (どれだ!高岩成二 恐怖の正体? Dore da! Takaiwa Seiji Kyōfu no Shōtai?) is the thirteenth episode of the webisode series, Kamen Rider Decade: All Riders Super Spin-off.
That One! Seiji Takaiwa: Terrifying Identity? (どれだ!高岩成二 恐怖の正体? Dore da! Takaiwa Seiji Kyōfu no Shōtai?) is the thirteenth episode of the webisode series, Kamen Rider Decade: All Riders Super Spin-off.