Adapt Any Season of Sentai or Rider to make a story you enjoy.
Ah the history of the world is questionable. Unknown to the very mankind who uses it is the key to the protection of billions. Through the access of the Morphing Grid people have been able to transform into beings known as "Power Rangers" and "Kamen Riders". These strange heroes have been able to be found all over the universe and in other universes as well.
However how have they come to existence? The range of entrances into the strange morphing grid is something that should become more known as these beings show up on Earth as a multitude of villains rise at such a strange timing. Why are all of them coming to Earth at once despite not being connected? Let the truth be told as you forge the history of the grid and of the world.