Di dunia Sougo Tokiwa dan Sento Kiryu, "teman" mereka kehilangan ingatan mereka satu demi satu saat mereka digantikan oleh orang lain. Super Time Jacker, Tid, muncul di depan mereka. Dia memerintahkan pasukanya yang kuat, untuk mengejar seorang bocah lelaki bernama Shingo. Saat berjuang untuk melindungi Shingo, Sougo bertemu Ataru, tetapi Ataru mengatakan bahwa Kamen Riders tidak nyata. Apa yang dia maksud Sementara itu, Sento Kiryu mencoba untuk mengambil Tid sendirian, tetapi dicuci otak dan dimanipulasi oleh Time Jacker sebagai hasilnya, Sougo dan Sento menuju ke Pegunungan Kriogatake di mana mereka harus menghadapi musuh sejati mereka.

In the world of Sougo Tokiwa and Sento Kiryu, their “companions” are losing their memories one after the other as they’re replaced by other people. The Super Time Jacker, Tid , appears before them. He orders his powerful underlings, Another Double and Another Den-O, to pursue a young boy called Shingo. While fighting to protect Shingo, Sougo meets Ataru, a young man who loves Riders, but Ataru says that Kamen Riders aren’t real. What does he mean? Meanwhile, Sento Kiryu attempts to take on Tid alone, but is brainwashed and manipulated by the Time Jacker as a result. With the mystery uncovered, Sougo and Sento head to the Kriogatake Mountains where they must face their true enemy.