Kamen Rider X Senran Kagura: Begin from their Era!

There are young men who had their powers of Kamen Rider, from the start period of each riders together with Showa, Heisei, and Reiwa. Then, they are certain to meet in the shinobi factions with beautiful females, between riders and ninjas. When Shocker and Yoma are going to take down the human race, they will begin to...