Harem-tou e Youkoso!

When a small exploration club consisting of one young man and three women attempts a carefree southern-island trip, a sudden storm leaves them stranded on a remote, uncharted isle. They soon discover they have crossed into another world: Harem Island, a sun-drenched paradise where nearly every inhabitant is an attractive woman and the local culture revolves around fertility, intimacy, and “island revitalization.”

Tasked by a mysterious deity with turning the once-thriving but now quiet island into a bustling tourist destination, the group begins exploring exotic plants, meeting the island’s alluring residents, and learning the peculiar local customs. The three women, already carrying unspoken feelings for their male companion, find their emotions and desires intensifying under the island’s influence. What starts as a survival-and-development mission rapidly evolves into a free-for-all harem lifestyle where boundaries dissolve and “development” takes on a very personal meaning.