Osamu Kaneda directed the films written by Jin Haganeya (Zangetsu) and Nobuhiro Mouri (Baron).
Takatora Kureshima is continuing preparations of Project Ark, which would mean the salvation of humanity at the cost of numerous lives.
The mysterious Rider sets their sights on Mitsuzane Kureshima and Takatora loses his Melon Energy Lockseed as a result.
While searching for clues, he uncovers the truth of his father's past and learns that the people at Zawame Child Care Facility were subjugated to lethal experiments to allow passage into Helheim.
While Kaito Kumon hunted for the Overlords during his alliance with Ryoma Sengoku, a foreign prince named Shapool visits Zawame as part of an inspection.
Meanwhile, Sid and Yoko investigate suicide attacks that have been taking place on Yggdrasill Corporation employees.
The mastermind of these incidents is the Black Linden cult, led by Ryoma's former colleague Kugai Kudo who was thought to have died in a Sengoku Driver testing accident.
Set after the events of Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle, it has been one year since Kouta and Mai left the Earth and Kaito died, and peace has returned to Zawame City once more.
Zack departs for New York to participate in a dance competition, leaving Peko in charge of Team Baron.
Zack returns to Zawame to fight Shura, who can transform into Kamen Rider Black Baron, but Zack is given a new Sengoku Driver and set of Lockseeds from Mitsuzane to fight once more as Kamen Rider Knuckle, but this time as the more powerful Jimber Marron Arms.
Oren, who now retires to return as a mercenary is enlisted by Takatora to investigate the re-appearance of Helheim's fruits, suspecting the source coming from Jonouchi.
Takatora immediately transform into Zangetsu Kachidoki Arms to prevent Slyphi furthering her evil plan.
At a brick of despair, Jonouchi was about to eat the fruit with no other option, but was prevented by the spirit of Hase, who transform the fruit into a Lychee Lockseed, allowing Gridon to achieve Lychee Arms and evenly matches King Durian's strength.
Once Gridon freed Bravo from Sylphi's corruption and purifying King Durian's power, both student and master reconcile each other.