Touma and the others are shocked to discover that Calibur is Daichi Kamijo, the previous Kamen Rider Saber while Kento is in distress over not knowing his father's whereabouts. Meanwhile, the Megids strike again and Daichi appears with a new power that makes him a bigger threat

Touma regains all his lost memories and realizes Daichi and the Megids' true objective, which is to recreate the same cataclysmic events of 15 years ago. Determined to stop them and avenge Kento, he obtains a new power.