After transmigrating into a crossover world, Yamada Yu gains the power of a Kamen Rider. Between dealing with the strange monsters that appear in his daily life and acting as a passing Kamen Rider, he gradually realizes that there might be a few too many people around him.
Ijichi Nijika: I'm your childhood friend, so why did everyone else get to you in the blink of an eye?
Yamada Ryo: What's so great about a childhood friend? An older sister is way better, right?
Nishikigi Chisato: Come on, partner, let's transform together!
Inoue Takina: Shouldn't I be the one transforming with you? Why Chisato?
Kasumigaoka Utaha: Bigger is better. Come with me to gather material!
The girls around him, all watching eagerly: What about me?
