Upon returning to Earth, Kit and a mysterious stranger named Len must face off against a monster. When Kit's father once again contacts him, he uses the Advent Deck and unleashes the dragon to become Kamen Rider Dragon Knight. Using this new power, he heads to the mirror world and saves Len, the newly transformed Kamen Rider Wing Knight. Now Kit must learn more of the secrets of Kamen Riders before it's too late.
