Other Title: 仮面ライダービルド-もう一人のビルド, Kamen Raidā Birudo-Mōhitori no Birudo
Summary: Sento's father, Shinobu Katsuragi, suddenly appears before the Riders!
Shinobu continues to reveal things that surprise all of them. Despite
the fact that the Build his father created appears to be their enemy,
Sento still tries to believe in Shinobu. Tension from within the team
starts to form surrounding this particular issue. Just then, Misora is
kidnapped by Evolto disguised as Soichi…!