Alternate titles
ハーレム島へようこそ！
During summer vacation, the protagonist and his three female friends from the adventure club (Sahoto, Mei, and Chiyo) get carried away by the sea and wash up on a mysterious island in another world. The island, known as Haremun Island, is populated almost entirely by women (99% female) and is in decline. The village chief explains that the island’s guardian deity foresaw their arrival and that they must help revitalize the island into a thriving tourist destination so the deity can regain enough power to send them home. What starts as a survival and development mission quickly turns into a full harem paradise filled with passionate encounters as the group works to “develop” both the island and its eager female residents.
