Confronting a mysterious enemy, the Pteranodon Yummy, Kamen Rider W receives aid from Ryu, who has infuriated Akiko by being too busy to attend her wedding! Akiko demands to know why he even became a Kamen Rider in the first place and the Pteranodon Yummy as it uses the Memory Memory on her to give her the answer to her question. Meanwhile, at the Kougami Foundation, Kousei Kougami talks of the most avaricious man in Japan, Oda Nobunaga, whose final resting place was found. With Doctor Maki overseeing the process, Kougami commissions the creation of a Cell Medal homunculus based on Nobunaga himself. Later, Kamen Rider Core begins to destroy the area as Kamen Riders OOO and W team up to fight the enemy. However, Kamen Rider Core proves too powerful and the two go underground to destroy the Gaia Memory’s source of power to even the odds.

The special event is a stage show held on December 20, 2009 at Shibuya C.C. Lemon Hall, to commemorate the release of the movie Kamen Rider x Kamen Rider W & Decade Movie Taisen 2010. It features the casts and song artists from the Kamen Rider W TV series.

Serving as the true ending to Kamen Rider Decade and revealing the origins of Kamen Rider W, this movie is split into three parts. In "Kamen Rider Decade: Final Chapter", Tsukasa Kadoya fully embraces his title as the Destroyer of Worlds. In "Kamen Rider W: Begins Night", Shotaro and Philip recount the night on when it all began. Elements of both parts converge in the movie's final part, "Movie War 2010" as our heroes fight the forces of Super Shocker.

Kanjuro Nomi is an aging samurai who only has a scabbard. Deserting his lord to wander the land with his daughter Tae, Kanjuro is captured and sentenced to an unusual punishment: he has 30 days to bring a smile to the sad prince who has lost his mother — or else he must die.

Amagane Rinne has a fatal accident while hurrying to her first day of school. She suddenly arrives at an awkward school... in Hell, filled with demons. While she struggles and wishes to go back to the world from whence she came, Rinne befriends her demon schoolmates and develops an uncommon bond.

Intercepting the transport carrying Foundation X’s new 2nd generation Gaia Memories, the special-ops unit NEVER, led by Daido Katsumi, intend to turn Fuuto into Hell on Earth. With Daido wielding the T2 Eternal Memory and a Lost Driver, granting him power in the form of Kamen Rider Eternal, Fuuto’s Kamen Riders are left powerless as Daido and his allies take control of Fuuto Tower, converting it into a massive laser weapon…