So Okuno

Forced to be a Kamen Rider again to save the world when a Time Jacker alters history, Sougo must now work with another Kamen Rider from another world. (imdb)

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 is the meaning of those words? ... (themoviedb)

A mysterious person restarts the Mirror World's Rider Battle. (imdb)

The history books say that when Sougo Tokiwa collected all the Heisei Ridewatches, he became Oma Zi-O, King of Time. But history isn't always what's written in books. What happens when the Quartzers appear and try to rewrite the history of the Heisei era? And who is Sougo if he wasn't born a king?

History was reset. Everyone was reborn into a carefree high school life. But something lingers... Geiz Myokouin is going to be a judo champion. But when an accident interrupts his dream, he has to rediscover why he was chasing it - before the servants of the demon king destroy him! White Woz wants him to become the savior he was in another life. Daiki Kaito wants to take back his greatest treasure. And Sougo and Tsukuyomi just want to support their friend! But what does Geiz want? (Ununnilium)

Kijima and Kuzumi, showing the problems they face as they try to move forward in their lives, and how they drift apart while still yearning to be together. A story of love and life, and fantasies and failures of a novelist and his lover. (imdb)