If you loved Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals, try Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals

Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai
What they share
Both films are directed by Takayuki Shibasaki, and they both carry the 3am cult, neon soaked, playful mood tags, and they sit in Action / Adventure / Science Fiction territory. If that's the register that drew you to Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals, the second film will land in a comparable space — through a different lens.
What Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai is
You're Kamen Rider Gaim, fighting Badan's scheme to invert the world. You vow to protect a boy with similar powers. But past Riders suddenly clash, split along Showa and Heisei lines. Shibasaki's film lacks subtlety, yet the action sequences deliver. It leaves one pondering franchise fatigue.