A mysterious person restarts the Mirror World's Rider Battle, thus making Shinji Kido and other war participants regain their memories and transforming abilities. With the appearance of Another Ryuki, Sougo Tokiwa and Geiz Myokoin investigate this event, becoming involved in the war themselves...
Continuity and Placement
Kamen Rider Zi-O: Between episodes 28 and 29, since Sougo and Geiz already know about Shinji Kido and Mirror World. Additionally, the Ryuki Ridewatch can be seen in episode 29, which aired the same date during the special's release.
In early promotional material, this miniseries was titled Part 2: Rider Time Ryuki (RIDER TIME 龍騎,Raida Taimu Ryūki).
The first two words in all episode's title begin with the letter "A".
This special marks the first on-screen appearance of Kamen Rider Odin's Survive Mugen Advent Card, as it was never used in the original Kamen Rider Ryuki television series. Also his onscreen transformation as well, which also never appeared in the series.
Kamen Riders Scissors, Tiger, Imperer, and Verde are given new users, rather than recasting their original actors.
It is actually unknown what is the corresponding riders of Seiji Takaiwa and Masashi Shirai. The existence of these two men may be a hint that there is actually 2 extra (15th and 16th) deck of Mirror Riders that are unseen in the original series or the tribute arc in Decade.
This special uses the original soundtrack from Kamen Rider Ryuki rather than the soundtrack that is used in Kamen Rider Zi-O.
The events of this special are presumed to be erased by Kamen Rider Ohma Zi-O's timeline reset as the main cause of the Rider War was directly linked to the storyline of Kamen Rider Zi-O instead of Kamen Rider Ryuki.