Following the new Kamen Rider tradition, Fourze and OOO will have a Movie War as well. This time, entitled Movie War MEGA MAX.
Even though the main Riders are Fourze and OOO, there will be more Riders appearing. The Seven legendary Riders, from Rider #1 to Stronger will make an appearance.
As everyone who has watched OOO knows that Ankh died as all the Core Medals disappeared. OOO without Ankh simply won’t work. So will Ankh somehow come back and how will Eiji transform into OOO?

While Fourze’s part will focus on a love story with Gentaro and a girl by the name of Nadeshiko Misaki. She seems to be able to transform into a Kamen Rider as well, but who is she really?

Nadeshiko Misaki is able to transform into Kamen Rider Nadeshiko, she’s willing to fight together with Fourze.

In Kamen Rider OOO’s part, a new Rider called Kamen Rider Poseidon is set to appear. A mysterious young man by the name of Miharu transforms into Poseidon.
Just like Kamen Rider OOO, Poseidon utilizes 3 Core Medals as well. The three Core Medals consists of the aquatic animals, Shark, Whale and Wolffish.