セックスオープンワールドへようこそ！

When the young Sejima Seiya tries to rescue a dog, the passing truck winds up sending him straight into a completely different world! In this brand new world, Seiya finds himself caught up in an ancient prophecy that someone from another world will arrive to give birth to the legendary heroes that will end the wars plaguing the lands. What is Seiya to do as key women from every major nation in this new world start accosting him for his baby batter in an attempt to ensure their nation holds the most influence over the heroes destined to be born?!