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E1
20 min 1. First Chapter
Nariaki Utsumi appears to help Build prepare for the proxy battle with Grease. This chapter takes place immediately after Sento obtains the Fullbottles from Hokuto and Seito in Episode 21, but one week prior to the scene where Build charges at Grease at the proxy duel.
E2
20 min 2. Next Chapter
This chapter takes place immediately after Sento obtains the Fullbottles from Hokuto and Seito in Episode 21, but one week prior to the scene where Build charges at Grease at the proxy duel. This episode features the debut of Build's ToraUFO, KirinCyclone and KujiraJet Best Match forms and Hell Bro’s.
E3
20 min 3. Final Chapter
This is third and final installment of Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~. It was released on alongside the DX Same and Bike Fullbottles in one set. It features the only appearance of Build's Same/Bike Form. This chapter takes place one month after the previous episode.
As Kiryu Sento prepares for the proxy battle against Kamen Rider Grease, Nariaki Utsumi appears and offer his help.
Genres: Action & Adventure, Sci-Fi & Fantasy, Drama
Stars: Atsuhiro Inukai, Yuki Ochi, Katsuya Kobayashi, Kaho Takada
