This premium event featured appearances by the main cast of Kamen Rider Build, who conversed and share stories about the filming of the show that fans were not able to hear elsewhere. The event also included a stage show with an original Kamen Rider Build story created just for the event, complete with lights, sounds, and special effects. The event was be held on Friday, May 4, 2018, and Saturday, May 5, 2018, at the Grand Prince Hotel New Takanawa.
| Actor | Role |
|---|---|
 Atsuhiro InukaiSento Kiryu / Kamen Rider Build | Sento Kiryu / Kamen Rider Build |
 Eiji AkasoRyuga Banjou / Kamen Rider Cross-Z | Ryuga Banjou / Kamen Rider Cross-Z |
 Kouhei TakedaKazumi Sawatari / Kamen Rider Grease | Kazumi Sawatari / Kamen Rider Grease |
 Kaho TakadaMisora Isurugi | Misora Isurugi |
 Yukari TakiSawa Takigawa | Sawa Takigawa |
 Yasuyuki MaekawaSouichi Isurugi | Souichi Isurugi |
 Kensei MikamiGentoku Himuro | Gentoku Himuro |
 Yuki OchiNariaki Utsumi | Nariaki Utsumi |