This movie is an alternate ending to the series, taking place after the events of episode 46. With only six Riders remaining in the Rider War, Shirō Kanzaki feels that time is running short.

20 years since the shocking final episode aired on January 19, 2003...On January 19, 2023, the anniversary of the final episode, a gorgeous cast will be in attendance at Theater G Rosso. With Nobuhiro Suzumura, who also served as the director, as MC, a talk event similar to a reunion was held, focusing on reminiscences from the time of filming. In response to many requests for a Blu-ray version, the Blu-ray of "Kamen Rider Ryuki 20th Anniversary Alumni Talk Event" will be released! What exactly happened at the final event of the 20th anniversary, which included the appearance of a secret guest and delivered more cheers than originally expected?

This television special is an alternate telling of the Kamen Rider Ryuki story. Shinji Kido's life, working as an employee at ORE Journal, takes a sharp turn after being pulled into the Mirror World by a Mispider. Luckily, he was saved by Kamen Rider Ryuki, Koichi Sakakibara. However, Sakakibara could no longer go on due to the severity of his injuries and passed his Card Deck to Shinji, allowing him to become the next Ryuki and defeat the monster.