Brought on by popularity for the series, this DVD Special feats. two half-hour side stories that take place during the events of the show. Both stories appear to take place just after episode 20, the first episode of the Helheim Saga. The Kamen Rider Zangetsu side story begins with Takatora telling Kota about the truth behind Helheim. While a childhood friend pays Takatora a visit, a mysterious Kamen Rider that has control over cracks begins to hunt down Yggdrasill’s forces. The Kamen Rider Baron side story begins with Kaito seeking out the Overlords for Professor Ryoma. A prince visits Zawame and when he finds out that Kaito looks exactly like him, he decides to forcefully switch lives, resulting in conflict.

In Zawame City, the Yggdrasil Corporation's roots are everywhere. To escape from the corporation's stifling presence, the dancing Beat Rider teams compete for street cred. But when Beat Riders start settling turf disputes using strange devices called Lockseeds, dimensional tears open across the city, unleashing the monstrous Inves. When ex-Beat Rider Kouta Kazuraba is caught up in an attack by a berserk Inves, he stumbles upon a high-tech device allowing him to transform into "Armored Rider Gaim" and defend his friends & the city.

Bad news: Kouta's not the only Armored Rider in Zawame with something to prove, and soon a modern version of the Warring States era erupts between the masked warriors. Soon the Riders will learn this was never just a game...