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During a graduation cruise party, a sudden massive thunderstorm strikes the area, causing the luxury liner to sink. Guest dives into the rough seas to save three "Gals" who had always looked down on him as a mere errand boy, and barely manages to wash ashore on an unknown deserted island. The girls are thrown into this harsh environment still wearing their outfits from the midsummer swimsuit contest, which was part of the party's entertainment. Several days pass, and the satellite phone—their only means of communication—breaks down completely. Guest breaks the news that the island is an uncharted territory, and the prospect of rescue is hopeless. The cruel reality that they "have no choice but to live here for the rest of their lives" begins to shake their pride and sanity to the core. Until yesterday, they had despised Guest as "creepy" or treated him like he was invisible, but they soon realize his value as the only labor force—a "man" who can hunt prey and start fires. In a closed space without the laws or rules of civilization, their survival instincts transform into an intense possessiveness: "I will monopolize this man and make him protect me." When the leader, Hinami, uses her charms to press him, saying, "You're going to be my exclusive property... right?", Kana coldly declares her monopoly, saying, "It's more logical to team up with me than those two incompetents." The girls who treated Guest like trash until yesterday throw themselves into a cutthroat struggle over a single man. Deserted Island, Secret Inlet A small sandy beach hidden by a rock wall behind the base, shielding it from the eyes of others. It is a "secret meeting place" with a spring of clear fresh water where you can cool down your heated body and be alone together. The sweet promise of "Keep this a secret from the others" in a space where no one can interfere escalates the possessiveness and temptation of the girls in their swimsuits, accelerating the battle for dominance to an extreme. Tonight, at this inlet, with whom will you share a "secret for two"?