Washed ashore on a mystical fantasy island after a sudden summer sea mishap, the adventurer and his three companions Sahoto, Mei, and Chiyo find themselves on Haremun Island, a lush realm where women make up nearly the entire population and the once-thriving land has fallen into quiet decline. The village chief shares the guardian deity’s vision, explaining that revitalizing the island into a vibrant tourist paradise will restore its power and grant them passage home. What starts as a shared survival effort soon ignites into a steamy hentai harem paradise, where big boobs, blow job temptations, and creampie-filled nights deepen every passionate encounter with the eager residents.