Kamen Rider Build The Trap of Project Build (2017–2018) Online
- Original Title :
- The Trap of Project Build
- Genre :
- TV Episode / Action
- Year :
- 2017–2018
- Directror :
- Kyohei Yamaguchi
- Cast :
- Atsuhiro Inukai,Eiji Akaso,Kaho Takada
- Writer :
- Shôgo Mutô
- Type :
- TV Episode
- Rating :
- 8.2/10
Sento and Ryuga discover that Katsuragi was involved in creating a Build Driver of his own, and his possible involvement with Sento widens the distrust between them.
| Episode credited cast: | |||
 | Atsuhiro Inukai | - | Sento Kiryu / Kamen Rider Build |
| Eiji Akaso | - | Ryuga Banjo |
| Kaho Takada | - | Misora Isurugi |
| Yuki Ochi | - | Nariaki Utsumi |
| Tsukasa Honjô | - | Eita Kawai |
| Yukari Taki | - | Sawa Takigawa |
| Kensei Mikami | - | Gentoku Himuro / Night Rogue |
 | Yasuyuki Maekawa | - | Soichi Isurugi |
| Meikyô Yamada | - | Taizan Himuro |
| Akira Hamada | - | Juzaburo Namba |
| Tetsuo Kanao | - | Blood Stalk (voice) |
| Katsuya Kobayashi | - | Build Driver (voice) (as KORBY) |
| Bucky Koba | - | Narration |
| Rest of cast listed alphabetically: | |||
| Yukiaki Kiyama | - | Takumi Katsuragi |
| Yuto Minamidate | - | Fan |