The two dramas from these two franchises also carry the same theme, namely Knights. And there are also differences, namely: Ryusoulger has a Dinosaur theme and Saber has a Book theme.

Both of these dramas get Anniversary before Fourze and Revice. The content of the story is also the same, but has the theme of Wild animals, God Beasts in one device with the title Story book in the same. also met his ancestors (Kamen Rider #1) for the first time in the history of the Kamen Rider franchise.

Actually, they are the 2nd Super Hero Toei in the Reiwa era, at the same time the timeslot is also the same and at the same time has crossover on the same day and movie.

-The Comedy is very similar and many more gags from Grand Blue and Watamote
-Very good for Slice of Life genre
-Many more Fights and Laughs
-Will be more of Parody

Because of Comedy and both characters are similar. For Kohei Imamura and Shina Nishina are also Otakus while Kae Serinuma and Iori Kitahara was also perspective Main Character for myself. Well they both to be Best Matching in both Movies too.