Harem Island ~My Seed Will Save This Sacred Place~

The protagonist has just received a dream invitation to \”Harem Island\”,
so he promptly uses up his company vacation time, and boards the first available ferry there.

The island is full of young and beautiful women, 31 in total including the receptionist.
And they’re all naked too.
It seems the protagonist’s seed is needed to bring plentiful impregnations and prosperity to the island.
It’s the dream situation, but the protagonist has only got 1 week.
Will his dick last!? Just how many girls can he impregnate!?