There’s now an official Facebook page for the Gaim Gaiden V-Cinema special. I’ve tried my best to use Google Translate on the summary but it doesn’t seem to tell much more about the plot, though it does tell us who’s involved. Details provided below.

The V-Cinema was brought on by the “overwhelming popularity” of Gaim in Japan.

The plot still only makes mention of some undiscovered truth, possibly in relation to these two Riders. “This is their stage now!” - It also seems they are definitely two separate stories placed on one DVD. The Kamen Rider Wiki cites that both stories are meant to take place after episode 20, but I found nothing saying this yet.

The Zangetsu portion is written by Jin Haganeya, and the Baron portion by Nobuhiro Mori. Both of them had previously worked on numerous episodes of Gaim and anything Gaim-related that Gen Urobuchi was not directly writing himself.

The story has a planned run time of 60 minutes, which presumably means both are 30 minutes in length.

As the initial listing suggested, this will be released on DVD and Blu-ray, both versions featuring a “Lockseed edition” with the Forbidden Ringo Lockseed.

Cast listing below is based on the actor names given, not the characters, but it’s unlikely they’ll be playing NEW characters:

Zangetsu story cast: Takatora, Mitchy, Ryoma, Minato, Sid, Kota

Baron story cast: Kaito, Zack, Peco, Jonouchi, Ryoma, Minato, Pierre, Kota

If you’d like some speculative thoughts on what this could be about, click “Read More”, but take my thoughts with a grain of salt because I could very well be missing some obvious information. I’ll probably get rid of this text if it turns out I am.

So, based on the cast list, it’s clear that at least Zangetsu’s portion may be prequel based. They left an opening for prequel content with Takatora’s first transformation, so this could easily transition into the first fight in Helheim and discovering the secrets it holds. As well, we could see how Takatora becomes the skilled fighter he is.

As for Baron’s portion, it’s hard to say. On the one hand I feel it could also be a prequel, perhaps an adaption of that short story about how the Beat Riders were formed, but on the other hand it seems to mostly use post-finale cast. The thing about this, though, it’s entirely possible they just had to make use of anyone who was immediately available after the movie. I’m mixed on what this could be. At the very least I suspect it to be something that’s meant to take place between episodes.

As always I’ll deliver on any details I find out.