Build NEW WORLD: Kamen Rider Grease will have a very special spin-off called "She said will get in relationship with Idol Otaku" (Original Japanese Title: ドルヲタ、推しと付き合うってよ / Doruota, oshi to tsukiautteyo). This will be screened along with Build NEW WORLD: Kamen Rider Grease.
It is a delusional Love Story by Kazumi Sawatari (Kamen Rider Grease) who is trying to be close to his Net Idol Miitan! Kazumi will not transform into Kamen Rider nor there will be any enemies. Misora Isurugi and the Three Crows are going to appear in this. These are the only cast of this delusional movie.
This movie's inspiration comes from the Opening Narration of Kamen Rider Build Episode 36.