Air date: 2018-02-05

Runtime: 20 min

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.

Air date: 2018-03-12

Runtime: 20 min

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.

Air date: 2018-04-30

Runtime: 20 min

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.