The Heisei era Kamen Rider summer movies have taken a lot of different forms over the years. First they started out as alternate universe adventures, but eventually began tying themselves into their respective series with varying degrees of impact. The recently they even took the form of an epilogue, with Ex-Aid's True Ending picking things up at the end of the series. So with all these different options at hand, it was going to be particularly interesting to see what route Kamen Rider Build decided to take – a series that's not only set in a parallel universe to begin with but also has been careful to tie its movies and spin-off material into the bigger picture. Released alongside Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger en Film, Kamen Rider Build the Movie: Be the One returns these movies to the usual post-Decade format – taking place just prior to the show's final endgame against Evolto.