Sex Open World e Youkoso! | セックスオープンワールドへようこそ！

Thanks to an accident, our protagonist 'Sejima Seiya' awakes to find himself in the parallel world of "Rolentide". In the land of Rolentide, there is an ancient legend which has been long held by the people...

-From a hero who arrives from a parallel world shall come the seed which will end the Era of War-

There is no doubt that the seed spoken thereof is that of our protagonist. "What am I, a stud horse!?" the hero thinks to himself, yet even be that as it may, our protagonist can't help but want to do it. And besides, to become the father of heroes is to become king of the world. And so it goes...

Led by the legend, beautiful women from all over the world begin to converge in order to claim our protagonists' seed.

...Maybe these heroines secretly desire to unite the world under their country's banner. ...Or maybe they just want to have sex with the hero.

Our main character's days of being exploited by beautiful women begin now...