Heartwarming / Kamen Rider Build: Be The One

• The movie starts with Sento having a Flash Back to the day the Skywall Disaster occurred. In the immediate aftermath of the incident, Shinobu Katsuragi's first thought was to look after his son, asking a nearby policeman to get Takumi to safety.
  • Later in the movie we see more of the flashback, with Sento asking his father why he became a scientist, though his answer is muted out. Much later, we finally hear his response: "Love and Peace". Like Father, Like Son indeed.
• Sento is put through his Darkest Hour. The Blood Race brainwashes everyone in Japan into hating Build, robbing him of all his allies, imprisoning Kazumi and Gentoku, and finally Kengo Ino twists the knife about him being a "fake hero" who only existed to further their goals. As he stands in the rain, even Takumi's personality seems ready to give up since all their work on the Build Project just lead to the Earth's destruction. Sento rebuffs him by pointing out that if they give up now, all the people they've met and befriended will be lost. He adds that it doesn't matter if the world hates him, or if he was created to be a puppet; the one thing that is undeniably real, that nobody can ever take away from him: the bonds he forged, especially with Banjo, who may be Dumb Muscle but will gladly risk his life to help those in need. If Sento's going to save the world then he's going to do it the same way he always has: with his irreplaceable partner at his side.
  • What really makes this scene is the combination of Atsuhiro Inukai's powerful acting and a slow, twinkling music box rendition of "Be the One". Just try not to cry when you watch it.
• During the final battle, Kamen Rider Blood is beating down on Sento while the people of Touto stand by and chant "Des-troy! Des-troy!" The camera pans through the crowd and shows Sawa and Misora participating, but much quieter than everyone else. Then Misora starts crying, showing that even if she's being mind controlled, deep down she cares about Sento. Even better, her tears fall on Vernage's bracelet, awakening the Queen of Mars who frees Misora and Sawa from the brainwashing and intervenes to help Sento save the day by creating the Cross-ZBuild Can.
• And after all is said and done, Sento and Banjo share a nice friendship moment, leading to the high five shown above.