Kamen Rider Ghost (2015)

Both series are Kamen Rider series that have Takuro Fukuda as the head screenwriter.

In both series, there is an other-dimensional world, which creates situation in which the heroes are needed. At some point, there is also a race/purpose to gathering the henshin items (eyecons and ridebooks/seikens).

There is a crossover series between the two series.