|This article is about a/an episode in Kamen Rider 555.|
Trio × Trio (３人×３人 Sannin × Sannin) is the sixth episode of Kamen Rider 555.
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While working in Keitaro's laundry business, Takumi burns some clothes. Mari believes that he is distracted due to what happened to his friend. She goes to visit her father again, with Takumi tagging along. Kiba, unhappy with what Smart Lady tells him of the Orphenochs, attempts to see the Smart Brain president but finds only a blank wall. He leaves, with Takumi and Mari following him. Naoya Kaido, the Snake Orphenoch, awakens but runs off before Yuka can explain what happened to him. Keitaro and Yuka meet again, but don't recognize each other. Takumi and Mari try to steal Kiba's Smart Brain pass card from his car but are caught. Keitaro finds Yuka's phone and returns it but they still don't know who the other is. Kaido goes for a job interview, his new Orphenoch powers allowing him to learn a dark secret about the interviewer. Soeno is assigned to investigate this man. Kaido goes back to learn what has happened to him from both Yuka and Kiba and decides to take revenge on those that have hurt him. At night, Kaido is attacked by the interviewer but kills him as the Snake Orphenoch. Takumi fights him as Faiz but Kiba transforms to stop it...
- Takumi Inui (乾 巧 Inui Takumi): Kento Handa (半田 健人 Handa Kento)
- Mari Sonoda (園田 真理 Sonoda Mari): Yuria Haga (芳賀 優里亜 Haga Yuria)
- Keitaro Kikuchi (菊池 啓太郎 Kikuchi Keitarō): Ken Mizorogi (溝呂木 賢 Mizorogi Ken)
- Yuji Kiba (木場 勇治 Kiba Yūji): Masayuki Izumi (泉 政行 Izumi Masayuki)
- Yuka Osada (長田 結花 Osada Yuka): Yoshika Kato (加藤 美佳 Katō Yoshika)
- Naoya Kaido (海堂 直也 Kaidō Naoya): Mitsuru Karahashi (唐橋 充 Karahashi Mitsuru)
- Smart Lady (スマートレディ Sumāto Redi): Hitomi Kurihara (栗原 瞳 Kurihara Hitomi)
- Joji Soeno (添野 錠二 Soeno Jōji): Taro Ishida (石田 太郎 Ishida Tarō)
- Sawamura (沢村 Sawamura): Koji Iwakawa (岩川 幸司 Iwakawa Kōji)
- Construction Yard Leader: Koichi Nagata (永田 耕一 Nagata Kōichi)
- Administrator: Kazuo Yamada (山田 和男 Yamada Kazuo)
- Construction Yard Manager: Tomisaburo Horikoshi (堀越 富三郎 Horikoshi Tomisaburo)
- As part of Super Hero Time, this episode aired alongside Bakuryuu Sentai Abaranger episode 3, Ep. 3: An Abare-Style Children's Hero.
- A same type of Keitaro's radio receiver in this episode will be use in a Faiz homage episode in Kamen Rider Zi-O 15 years later
Blu-ray Box 1 comes with 17 episodes.