A boy that got cheated by his 5 Ex-girlfriend and they left him.They didn't know that he is Kamen Rider Build and he will save the city from Smash and Monsters.Also he will have a lot of girls fell in love with him. (Don't Own Anything Expect This OC)

Hiroki has recently discovered that the four women he once knew and loved, his girlfriend (Nao), sister (Kanoko), best friend (Ayumu), and mom (Kaede), have been doing it with the new Black Transfer Student (which is his school bully too) from his school, as they do it for nothing but joy and pleasure. This shocked Hiroki beyond belief, and since then, the poor traumatized boy has gone missing for months to come by. His sudden and unexpected odd absence caused his family (as well as his girlfriend and best friend) to leave their depraved life in a desperate attempt to search for him. But, unfortunately, to no avail. However, one day, the four girls were suddenly transported to an unfamiliar place. A dome-like theatre in which they have no choice but to react... Little did they know, they would be reacting to Hiroki as a Jujutsu Sorcerer?! (TW: ANGST, SWEARS, BLOOD AND GORE-'cause it's JJK too)