When twin sisters Haruka and Natsumi went to 'Con, neither expected to see a man dressed as Kamen Rider Eternal selling merchandise.
Of course, buying said merchandise was just the first mistake either of them would make.
"Henshin!" "Henshin!"
"Kamen Rider Kiva-la!" "Kamen Rider Larc!"
Now they fight their way from a cautious (yet curious) Celestia and an irate (but reasonable) Luna, in hopes of finding some place where they can just be left in peace for two seconds, goddammit!