Kamen Rider Wandering in the Ultra World

I'm just a passing Kamen Rider, remember it for me. What interesting story would happen if an ordinary person accidentally enters the Ultra world? Tentative world, Tiga, Super Dimensional Decisive Battle, Final Holy War, others to be determined, newbies and new books, please help me, if you feel it is poisonous, please feel free to leave it, otherwise I will not be held responsible for the poisonous death. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.