As a young man watches pornography, the flooring underneath him collapses, and he dies on the spot. After death, he meets the gorgeous goddess Ada Ruto, who takes pity on him for never knowing the joys of lovemaking and reincarnates him in another world.

When the man next opens his eyes, he is a baby named Sao, the son of a voluptuous mother who immediately catches his attention. Much to his surprise, the residents of the village he was reborn in are extremely open-minded about sex. Now in a world where even the weapons and magical skills seem to have an erotic aspect to them, Sao begins a raunchy new adventure.