A Guy in a Kamen Suit, but Genderbent

The story begins when a boy transmigrates to the world of Kamen Rider.

But everyone is gender-swapped into girls.

But as far as Lu Bei is concerned, as long as they're Riders, that's all that matters.

Except...

Yusuke Godai: "Our fates have been linked since ancient times."

Looking at all these girls, Lu Bei can only say, "I just want to be a Kamen Rider."