So these chicks want our protagonist to take over a shrine and become a prist. He says he ain't interested. They propose a radical idea. How about he just impregnate them, and his kid can take over the shrine when he grows up! Why of course!
It seems that everyone is fighting over Seiryu-kun's genes! They've even made a competition out of it! This is a crazy rom-com adventure, where a high school student and her friend are trying to get impregnated.