Just watch. This mini-series will probably be the best thing to come out of this film, like Kamen Rider #4 was to Super Hero War GP. Though Kento Shimoyama writing it has me a bit worried.
Also: Another Agito? Out of all the dead Riders to choose from, that's certainly an interesting choice (I'm genuinely surprised it's not Chase). Not complaining though, he was my favorite out of the four Riders in Agito. Blade is a bit out of place though, since he's the only one among them who's not actually dead. Yeah, I know the blurb says "disappeared" Riders as well, but he's the only one who disappeared.